CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common shares and paid-in surplus	Retained earnings	AOCI, after tax	Total	Non-controlling interest	Total Equity	Foreign Currency Gain (Loss) AOCI, after tax	Foreign Currency Gain (Loss) Total	Foreign Currency Gain (Loss) Non-controlling interest	Foreign Currency Gain (Loss) Total Equity	BAM Non-controlling interest	BAM Total Equity	MediaAlpha Non-controlling interest	MediaAlpha Total Equity
Members Capital Contribution	$ (19.9)
Beginning Balances at Dec. 31, 2018		$ 584.0	$ 2,264.9	$ (5.8)	$ 2,843.1	$ (124.9)	$ 2,718.2
Increase (Decrease) in Shareholders' Equity
Net (loss) income	288.1		304.9		304.9	(16.8)	288.1
Net change in foreign currency translation and other								$ 3.2	$ 3.2	$ 0.2	$ 3.4
Total comprehensive loss	301.5		(304.9)	3.2	(301.7)	17.0	(284.7)
Dividends declared on common shares			(3.2)		$ (3.2)		(3.2)
Dividends to non-controlling interests						$ (1.0)	$ (1.0)
Stock Issued During Period, Shares, New Issues		2.2			2.2	0.0	2.2
Repurchases and retirements of common shares		$ (1.1)	(3.8)		$ (4.9)		$ (4.9)
Capital contributions from BAM members, net of tax												$ 17.0	$ 17.0
Net contributions and dilution from non-controlling interests						$ 1.5	1.5
Amortization of restricted share awards		5.1			5.1		5.1
Recognition of equity-based units of subsidiary		0.3			0.3	0.0	0.3
Effect of deconsolidation of MediaAlpha														$ (13.8)	$ (13.8)
Acquisition of non-controlling interests						1.8	1.8
Ending Balances at Jun. 30, 2019		590.5	2,562.8	(9.0)	3,144.3	(136.4)	3,007.9
Beginning Balances at Mar. 31, 2019		$ 585.8	2,542.3	(6.1)	3,122.0	(143.7)	2,978.3
Increase (Decrease) in Shareholders' Equity
Net (loss) income	15.9		20.5		20.5	(4.6)	15.9
Net change in foreign currency translation and other								$ 2.9	2.9	0.2	3.1
Total comprehensive loss	17.4		(20.5)	2.9	$ (17.6)	4.8	(12.8)
Dividends to non-controlling interests						$ (0.5)	$ (0.5)
Stock Issued During Period, Shares, New Issues		2.2			2.2	0.0	2.2
Repurchases and retirements of common shares		$ (0.1)	0.0		$ (0.1)		$ (0.1)
Capital contributions from BAM members, net of tax												10.2	10.2
Net contributions and dilution from non-controlling interests						$ 0.8	0.8
Amortization of restricted share awards		2.6			2.6		2.6
Acquisition of non-controlling interests						1.6	1.6
Ending Balances at Jun. 30, 2019		590.5	2,562.8	(9.0)	3,144.3	(136.4)	3,007.9
Members Capital Contribution	(31.5)
Beginning Balances at Dec. 31, 2019	3,144.7	$ 596.3	2,672.4	(7.2)	3,261.5	(116.8)	3,144.7
Increase (Decrease) in Shareholders' Equity
Net (loss) income	(32.0)		(13.4)		(13.4)	(18.6)	(32.0)
Net change in foreign currency translation and other				(3.1)					(3.1)	0.1	(3.0)
Total comprehensive loss	(16.3)		(13.4)	(3.1)	(16.5)	(18.5)	(35.0)
Dividends declared on common shares			(3.2)		$ (3.2)		(3.2)
Dividends to non-controlling interests						$ (1.4)	$ (1.4)
Stock Issued During Period, Shares, New Issues		1.3			1.3	0.0	1.3
Repurchases and retirements of common shares		$ (18.6)	(66.5)		$ (85.1)		$ (85.1)
Capital contributions from BAM members, net of tax												31.5	31.5
Net contributions and dilution from non-controlling interests		(0.7)			(0.7)	$ 2.5	1.8
Amortization of restricted share awards		8.7			8.7		8.7
Ending Balances at Jun. 30, 2020	3,063.3	587.0	2,589.3	(10.3)	3,166.0	(102.7)	3,063.3
Beginning Balances at Mar. 31, 2020		$ 589.3	2,498.0	(10.6)	3,076.7	(117.6)	2,959.1
Increase (Decrease) in Shareholders' Equity
Net (loss) income	107.6		115.4		115.4	(7.8)	107.6
Net change in foreign currency translation and other				0.3					$ 0.3	$ 0.1	$ 0.4
Total comprehensive loss	115.9		115.4	0.3	115.7	(7.7)	108.0
Dividends declared on common shares			0.0		$ 0.0		0.0
Dividends to non-controlling interests						$ (0.9)	$ (0.9)
Stock Issued During Period, Shares, New Issues		1.3			1.3	0.0	1.3
Repurchases and retirements of common shares		$ (6.5)	(24.1)		$ (30.6)		$ (30.6)
Capital contributions from BAM members, net of tax												$ 21.5	$ 21.5
Net contributions and dilution from non-controlling interests		(0.7)			(0.7)	$ 2.0	1.3
Amortization of restricted share awards		3.6			3.6		3.6
Ending Balances at Jun. 30, 2020	$ 3,063.3	$ 587.0	$ 2,589.3	$ (10.3)	$ 3,166.0	$ (102.7)	$ 3,063.3