CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Millions	Total	Total	Common shares and paid-in surplus	Retained earnings	AOCI, after tax	Non-controlling interest	Total Equity	BAM Non-controlling interest	BAM Total Equity
Beginning Balances at Dec. 31, 2020		$ 3,906.0	$ 595.2	$ 3,311.2	$ (0.4)	$ (88.1)	$ 3,817.9
Increase (Decrease) in Shareholders' Equity
Net income (loss)	$ (361.9)	(308.2)		(308.2)		(53.7)	(361.9)
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group	0.0
Other comprehensive income (loss), net of tax	(0.3)	0.4			0.4		0.4
Comprehensive income (loss)	(307.6)	(307.8)		(308.2)	0.4	(53.7)	(361.5)
Dividends declared on common shares		(3.1)		(3.1)			(3.1)
Dividends to non-controlling interests						(1.8)	(1.8)
Issuances of common shares		1.7	1.7				1.7
Issuances of shares of non-controlling interests						6.1	6.1
Repurchases and retirements of common shares		(94.6)	(16.6)	(78.0)			(94.6)
BAM member surplus contribution, net of tax								$ 44.8	$ 44.8
Amortization of restricted share awards		11.1	11.1				11.1
Recognition of equity-based compensation expense of subsidiaries		2.0	2.0			0.3	2.3
Net contributions and dilution from other non-controlling interests		6.4	(7.2)	13.4	0.2	(5.3)	1.1
Acquisition of non-controlling interests						230.3	230.3
Ending Balances at Sep. 30, 2021		3,521.7	586.2	2,935.3	0.2	132.6	3,654.3
Beginning Balances at Jun. 30, 2021		3,978.2	597.2	3,378.6	2.4	129.8	4,108.0
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(383.9)	(371.4)		(371.4)		(12.5)	(383.9)
Net change in foreign currency translation and other		(2.2)			(2.2)	(0.2)	(2.4)
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group	0.0
Other comprehensive income (loss), net of tax	0.0
Comprehensive income (loss)	(373.6)	(373.6)		(371.4)	(2.2)	(12.7)	(386.3)
Dividends to non-controlling interests						(0.6)	(0.6)
Repurchases and retirements of common shares		(87.1)	(15.2)	(71.9)			(87.1)
BAM member surplus contribution, net of tax								14.7	14.7
Amortization of restricted share awards		3.6	3.6				3.6
Recognition of equity-based compensation expense of subsidiaries		0.2	0.2				0.2
Net contributions and dilution from other non-controlling interests		0.4	0.4			1.4	1.8
Ending Balances at Sep. 30, 2021		3,521.7	586.2	2,935.3	0.2	132.6	3,654.3
Beginning Balances at Dec. 31, 2021	3,704.7	3,548.1	588.9	2,957.5	1.7	156.6	3,704.7
Increase (Decrease) in Shareholders' Equity
Net income (loss)	650.9	752.4		752.4		(101.5)	650.9
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group	2.9	2.9			2.9		2.9
Other comprehensive income (loss), net of tax	(3.0)	(7.8)			(7.8)	(0.4)	(8.2)
Comprehensive income (loss)	747.1	747.5		752.4	(4.9)	(101.9)	645.6
Dividends declared on common shares		(3.0)		(3.0)			(3.0)
Dividends to non-controlling interests						(7.5)	(7.5)
Issuances of common shares		3.0	3.0				3.0
Issuances of shares of non-controlling interests						74.6	74.6
Repurchases and retirements of common shares		(610.5)	(89.2)	(521.3)			(610.5)
BAM member surplus contribution, net of tax								62.3	62.3
Amortization of restricted share awards		10.3	10.3				10.3
Recognition of equity-based compensation expense of subsidiaries		8.1	8.1			0.8	8.9
Net contributions and dilution from other non-controlling interests		4.5	14.2	(9.7)		(9.1)	(4.6)
Disposition of non-controlling interests						(17.5)	(17.5)
Ending Balances at Sep. 30, 2022	3,866.3	3,708.0	535.3	3,175.9	(3.2)	158.3	3,866.3
Beginning Balances at Jun. 30, 2022		3,323.3	603.2	2,725.1	(5.0)	168.7	3,492.0
Increase (Decrease) in Shareholders' Equity
Net income (loss)	869.5	888.2		888.2		(18.7)	869.5
Net change in foreign currency translation and other		(1.1)			(1.1)	0.3	(0.8)
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group	2.9	2.9			2.9		2.9
Other comprehensive income (loss), net of tax	(1.4)
Comprehensive income (loss)	890.4	890.0		888.2	1.8	(18.4)	871.6
Dividends to non-controlling interests						(0.5)	(0.5)
Repurchases and retirements of common shares		(508.9)	(71.5)	(437.4)			(508.9)
BAM member surplus contribution, net of tax								$ 26.0	$ 26.0
Amortization of restricted share awards		3.8	3.8				3.8
Recognition of equity-based compensation expense of subsidiaries		0.4	0.4			0.2	0.6
Net contributions and dilution from other non-controlling interests		(0.6)	(0.6)			(0.2)	(0.8)
Disposition of non-controlling interests	(17.5)					(17.5)
Ending Balances at Sep. 30, 2022	$ 3,866.3	$ 3,708.0	$ 535.3	$ 3,175.9	$ (3.2)	$ 158.3	$ 3,866.3