Variable interest entities - TP Enhanced Fund summarized financial information (Details) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investment income
Net realized gain (loss) from securities, derivative contracts and foreign currency translations							$ 30,800,000	$ 48,400,000	$ 100,000
Net change in unrealized gain (loss) on securities, derivative contracts and foreign currency translations							(47,700,000)	20,800,000	15,200,000
Net loss from currencies	$ 27,500,000	$ 16,100,000	$ (12,000,000.0)	$ 12,400,000	$ 400,000	$ 16,500,000	44,000,000.0	(5,200,000)	(3,600,000)
Other income	6,600,000	9,100,000	7,900,000	1,800,000	9,700,000	18,800,000	25,400,000	14,700,000	17,600,000
Total revenues	398,000,000.0	732,600,000	561,500,000	488,600,000	1,050,100,000	1,782,700,000	2,180,700,000	889,700,000	982,600,000
Expenses
Interest	9,600,000	9,700,000	9,800,000	4,900,000	14,700,000	24,400,000	34,000,000.0	8,200,000	8,200,000
Other expenses	72,100,000	59,900,000	55,700,000	78,900,000	134,600,000	194,500,000	266,600,000	41,900,000	36,200,000
Net income (loss)	(136,800,000)	$ (47,400,000)	$ 70,100,000	$ 169,900,000	$ 240,000,000.0	$ 192,600,000	55,800,000	143,800,000	200,600,000
Assets
Total investments in securities and affiliated funds	4,529,900,000						4,529,900,000	1,160,900,000
Cash and cash equivalents	999,800,000						999,800,000	526,000,000.0
Due from brokers	15,900,000						15,900,000	94,900,000
Interest and dividends receivable	8,300,000						8,300,000	900,000
Other assets	126,800,000						126,800,000	18,800,000
Total assets	10,618,300,000						10,618,300,000	3,535,200,000
Liabilities
Accounts payable and accrued expenses	229,800,000						229,800,000	17,600,000
Securities sold, not yet purchased, at fair value	0						0	12,000,000.0
Due to brokers	6,500,000						6,500,000	0
Derivative liabilities at fair value	3,200,000						3,200,000	1,000,000.0
Amounts due to affiliates	0						0
Total liabilities	8,115,000,000						8,115,000,000	1,969,900,000
TP Enhanced Fund
Investment income
Net realized gain (loss) from securities, derivative contracts and foreign currency translations							616,500,000	6,100,000	(35,600,000)
Net change in unrealized gain (loss) on securities, derivative contracts and foreign currency translations							(188,400,000)	289,400,000	333,500,000
Net loss from currencies							0	(600,000)	(2,100,000)
Dividend and interest income							33,400,000	35,400,000	46,400,000
Other income							0	900,000	7,500,000
Total revenues							461,500,000	331,200,000	349,700,000
Expenses
Management fees							16,700,000	14,500,000	17,100,000
Interest							5,800,000	7,500,000	16,300,000
Dividends on securities sold, not yet purchased							10,600,000	4,700,000	8,700,000
Administrative and professional fees							4,300,000	4,100,000	4,300,000
Other expenses							4,000,000.0	1,100,000	2,400,000
Total expenses							41,400,000	31,900,000	48,800,000
Net income (loss)							420,100,000	299,300,000	$ 300,900,000
Assets
Total investments in securities and affiliated funds	1,623,500,000						1,623,500,000	2,200,900,000
Cash and cash equivalents	100,000						100,000	40,100,000
Due from brokers	524,000,000.0						524,000,000.0	124,600,000
Derivative assets at fair value	46,500,000						46,500,000	37,000,000.0
Interest and dividends receivable	3,100,000						3,100,000	3,200,000
Other assets	1,500,000						1,500,000	3,900,000
Total assets	2,198,700,000						2,198,700,000	2,409,700,000
Liabilities
Accounts payable and accrued expenses	1,100,000						1,100,000	1,000,000.0
Securities sold, not yet purchased, at fair value	290,400,000						290,400,000	183,000,000.0
Securities sold under agreement to repurchase	33,600,000						33,600,000	5,500,000
Due to brokers	493,600,000						493,600,000	894,000,000.0
Derivative liabilities at fair value	8,400,000						8,400,000	23,700,000
Interest and dividends payable	700,000						700,000	700,000
Management fee payable	200,000						200,000	200,000
Total liabilities	1,217,500,000						1,217,500,000	1,183,100,000
Total partners' capital	981,200,000						981,200,000	1,226,600,000
TP Enhanced Fund | TP GP
Liabilities
Amounts due to affiliates	139,500,000						139,500,000	75,000,000.0
TP Enhanced Fund | SiriusPoint
Liabilities
Amounts due to affiliates	$ 250,000,000.0						$ 250,000,000.0	$ 0