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, 2021		$ 3,548.1	$ 588.9	$ 2,957.5	$ 1.7	$ 156.6	$ 3,704.7
Increase (Decrease) in Shareholders' Equity
Net income (loss)	$ (218.6)	(135.8)		(135.8)		(82.8)	(218.6)
Other comprehensive income (loss), net of tax	(1.5)	(0.8)			(0.8)	(0.7)	(1.5)
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group		(5.9)			(5.9)		(5.9)
Comprehensive income (loss)	(143.2)	(142.5)		(135.8)	(6.7)	(83.5)	(226.0)
Dividends declared on common shares		(3.0)		(3.0)			(3.0)
Dividends to noncontrolling interests						(7.0)	(7.0)
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		(101.6)	(17.7)	(83.9)			(101.6)
BAM member surplus contribution, net of tax								$ 36.3	$ 36.3
Amortization of restricted share awards		6.5	6.5				6.5
Recognition of equity-based compensation expense of subsidiaries		7.7	7.7			0.6	8.3
Net contributions and dilution from other noncontrolling interests		5.1	14.8	(9.7)		(8.9)	(3.8)
Ending Balances at Jun. 30, 2022		3,323.3	603.2	2,725.1	(5.0)	168.7	3,492.0
Beginning Balances at Mar. 31, 2022		3,542.1	586.3	2,956.2	(0.4)	127.2	3,669.3
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(210.2)	(169.2)		(169.2)		(41.0)	(210.2)
Other comprehensive income (loss), net of tax	(1.1)	(0.6)			(0.6)	(0.5)	(1.1)
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group		(4.0)			(4.0)		(4.0)
Comprehensive income (loss)	(174.3)	(173.8)		(169.2)	(4.6)	(41.5)	(215.3)
Dividends to noncontrolling interests						(6.4)	(6.4)
Issuances of common shares		2.2	2.2				2.2
Issuances of shares of non-controlling interests						74.6	74.6
Repurchases and retirements of common shares		(62.6)	(10.4)	(52.2)			(62.6)
BAM member surplus contribution, net of tax								24.0	24.0
Amortization of restricted share awards		3.6	3.6				3.6
Recognition of equity-based compensation expense of subsidiaries		6.5	6.5			0.4	6.9
Net contributions and dilution from other noncontrolling interests		5.3	15.0	(9.7)		(9.6)	(4.3)
Ending Balances at Jun. 30, 2022		3,323.3	603.2	2,725.1	(5.0)	168.7	3,492.0
Beginning Balances at Dec. 31, 2022	3,935.0	3,746.9	538.6	3,211.8	(3.5)	188.1	3,935.0
Increase (Decrease) in Shareholders' Equity
Net income (loss)	204.4	199.1		199.1		5.3	204.4
Other comprehensive income (loss), net of tax	2.6	1.8			1.8	0.8	2.6
Comprehensive income (loss)	201.7	200.9		199.1	1.8	6.1	207.0
Dividends declared on common shares		(2.6)		(2.6)			(2.6)
Dividends to noncontrolling interests						(7.8)	(7.8)
Issuances of common shares		2.1	2.1				2.1
Repurchases and retirements of common shares		(32.7)	(5.1)	(27.6)			(32.7)
BAM member surplus contribution, net of tax								26.5	26.5
Amortization of restricted share awards		7.2	7.2				7.2
Recognition of equity-based compensation expense of subsidiaries		0.9	0.9			0.3	1.2
Net contributions and dilution from other noncontrolling interests		(0.5)	(0.5)			(0.1)	(0.6)
Disposition of noncontrolling interests						(9.4)	(9.4)
Ending Balances at Jun. 30, 2023	4,125.9	3,922.2	543.2	3,380.7	(1.7)	203.7	4,125.9
Beginning Balances at Mar. 31, 2023		3,902.4	537.8	3,367.3	(2.7)	190.4	4,092.8
Increase (Decrease) in Shareholders' Equity
Net income (loss)	17.2	19.6		19.6		(2.4)	17.2
Other comprehensive income (loss), net of tax	1.4	1.0			1.0	0.4	1.4
Comprehensive income (loss)	21.0	20.6		19.6	1.0	(2.0)	18.6
Dividends to noncontrolling interests						(0.6)	(0.6)
Issuances of common shares		2.0	2.0				2.0
Repurchases and retirements of common shares		(7.4)	(1.2)	(6.2)			(7.4)
BAM member surplus contribution, net of tax								$ 14.7	$ 14.7
Amortization of restricted share awards		4.1	4.1				4.1
Recognition of equity-based compensation expense of subsidiaries		0.5	0.5			0.1	0.6
Net contributions and dilution from other noncontrolling interests						1.1	1.1
Ending Balances at Jun. 30, 2023	$ 4,125.9	$ 3,922.2	$ 543.2	$ 3,380.7	$ (1.7)	$ 203.7	$ 4,125.9