CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ 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	NSM Holding Co LLC
Beginning Balances at Dec. 31, 2017		$ 670.6	$ 2,823.2	$ (1.3)	$ 3,492.5	$ (131.7)	$ 3,360.8
Increase (Decrease) in Shareholders' Equity
Net income (loss)	$ (81.5)		(44.5)		(44.5)	(37.0)	(81.5)
Net change in foreign currency translation and other				(0.9)				$ (0.9)	$ (0.9)	$ 0.0	$ (0.9)
Total comprehensive income (loss)	(45.4)		(44.5)		(45.4)	(37.0)	(82.4)
Dividends declared on common shares			(3.8)		(3.8)		(3.8)
Dividends to non-controlling interests						(4.2)	(4.2)
Repurchases and retirements of common shares		(104.7)	(408.4)		(513.1)	0.0	(513.1)
Issuance of common shares		1.9			1.9		1.9
Capital contributions from BAM members, net of tax												$ 12.6	$ 12.6
Amortization of restricted share awards		6.5			6.5		6.5
Recognition of equity-based units of subsidiary		4.3			4.3	2.4	6.7
Dilution from equity-based units of subsidiary		(1.1)			(1.1)	1.1	0.0
Acquisition of subsidiary		(1.7)			(1.7)		(1.7)
Acquisition of non-controlling interests	14.2					14.2
Ending Balances at Jun. 30, 2018		575.8	2,366.5	(2.2)	2,940.1	(142.6)	2,797.5
Beginning Balances at Mar. 31, 2018		675.3	2,765.0	(1.3)	3,439.0	(143.2)	3,295.8
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(14.9)		3.5		3.5	(18.4)	(14.9)
Net change in foreign currency translation and other				(0.9)				(0.9)	(0.9)	0.0	(0.9)
Total comprehensive income (loss)	2.6		3.5		2.6	(18.4)	(15.8)
Dividends to non-controlling interests						(3.9)	(3.9)
Repurchases and retirements of common shares		(102.8)	(402.0)		(504.8)	0.0	(504.8)
Capital contributions from BAM members, net of tax												8.4	8.4
Net contributions from non-controlling interests						0.0	0.0
Amortization of restricted share awards		3.1			3.1		3.1
Recognition of equity-based units of subsidiary		0.2			0.2	0.1	0.3
Dilution from equity-based units of subsidiary		(0.2)			(0.2)	0.2	0.0
Acquisition of subsidiary		(1.7)			(1.7)		(1.7)
Acquisition of non-controlling interests																$ 14.2
Issuances of shares to non-controlling interests		1.9			1.9		1.9
Ending Balances at Jun. 30, 2018		575.8	2,366.5	(2.2)	2,940.1	(142.6)	2,797.5
Beginning Balances at Dec. 31, 2018	2,718.2	584.0	2,264.9	(5.8)	2,843.1	(124.9)	2,718.2
Increase (Decrease) in Shareholders' Equity
Net income (loss)	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 income (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)
Repurchases and retirements of common shares		(1.1)	(3.8)		(4.9)		(4.9)
Issuance of common shares		2.2			2.2		2.2
Capital contributions from BAM members, net of tax												17.0	17.0
Net contributions 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		0.3
Effect of deconsolidation of MediaAlpha														$ (13.8)	$ (13.8)
Acquisition of non-controlling interests		0.0			0.0	1.8	1.8
Ending Balances at Jun. 30, 2019	3,007.9	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 income (loss)	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 income (loss)	17.4		20.5	(2.9)	17.6	(4.8)	12.8
Dividends to non-controlling interests						(0.5)	(0.5)
Repurchases and retirements of common shares		(0.1)	0.0		(0.1)		(0.1)
Issuance of common shares		2.2			2.2		2.2
Capital contributions from BAM members, net of tax												$ 10.2	$ 10.2
Net contributions from non-controlling interests						0.8	0.8
Amortization of restricted share awards		2.6			2.6		2.6
Acquisition of non-controlling interests		0.0			0.0	1.6	1.6
Ending Balances at Jun. 30, 2019	$ 3,007.9	$ 590.5	$ 2,562.8	$ (9.0)	$ 3,144.3	$ (136.4)	$ 3,007.9