Profit Or Loss [Abstract]

Clarkson PLC - Filing #1597016

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Profit or loss [abstract]
Profit (loss) [abstract]
Revenue	—	—	—	– GBP	443,300,000 GBP	—	443,300,000 GBP	—	—	—	358,200,000 GBP	—	– GBP	—	358,200,000 GBP	– GBP	—
Cost of sales	—	—	—	– GBP	16,500,000 GBP	—	16,500,000 GBP	—	—	—	13,300,000 GBP	—	– GBP	—	13,300,000 GBP	– GBP	—
Gross profit	—	—	—	– GBP	426,800,000 GBP	—	426,800,000 GBP	—	—	—	344,900,000 GBP	—	– GBP	—	344,900,000 GBP	– GBP	—
Administrative expenses	—	—	—	300,000 GBP	355,700,000 GBP	—	356,000,000 GBP	—	—	—	359,600,000 GBP	—	60,600,000 GBP	—	298,500,000 GBP	500,000 GBP	—
Profit (loss) from operating activities	—	—	—	300,000 GBP	7 1 .1 GBP	—	70,800,000 GBP	—	—	—	14,700,000 GBP	—	60,600,000 GBP	—	46,400,000 GBP	500,000 GBP	—
Finance income	—	—	—	– GBP	1,300,000 GBP	—	1,300,000 GBP	—	—	—	1,200,000 GBP	—	– GBP	—	1,200,000 GBP	– GBP	—
Finance costs	—	—	—	– GBP	3. 1 GBP	—	3. 1 GBP	—	—	—	3. 1 GBP	—	– GBP	—	3. 1 GBP	– GBP	—
Profit (loss) before tax	—	—	—	300,000 GBP	69,400,000 GBP	—	69. 1 GBP	—	—	—	16,400,000 GBP	—	60,600,000 GBP	—	44. 7 GBP	500,000 GBP	—
Tax expense (income)	—	—	—	– GBP	14,700,000 GBP	—	14. 7 GBP	—	—	—	9,400,000 GBP	—	– GBP	—	9,500,000 GBP	100,000 GBP	—
Profit (loss)	4,300,000 GBP	– GBP	– GBP	300,000 GBP	54,700,000 GBP	50 .1 GBP	54,400,000 GBP	5 0 .1 GBP	28,900,000 GBP	– GBP	25,800,000 GBP	3 .1 GBP	60,600,000 GBP	28,900,000 GBP	35,200,000 GBP	0 .4 GBP	– GBP
Profit (loss), attributable to [abstract]
Profit (loss), attributable to owners of parent	—	—	—	300,000 GBP	50,400,000 GBP	—	5 0 .1 GBP	—	—	—	28,900,000 GBP	—	60,600,000 GBP	—	32. 1 GBP	400,000 GBP	—
Profit (loss), attributable to non-controlling interests	—	—	—	– GBP	4,300,000 GBP	—	4,300,000 GBP	—	—	—	3 .1 GBP	—	– GBP	—	3 .1 GBP	– GBP	—
Earnings per share [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Earnings per share [abstract]
Earnings per share [line items]
Basic earnings per share [abstract]
Basic earnings (loss) per share	—	—	—	—	165.6	—	164.6	—	—	—	95.2	—	—	—	106.0	—	—
Diluted earnings per share [abstract]
Diluted earnings (loss) per share	—	—	—	—	164.2	—	163.2	—	—	—	95.2	—	—	—	105.8	—	—