Consolidated Statements of Changes in Shareholders' Equity (Deficit) Statement - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent	Treasury Stock	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2017		758,700,000				318,400,000
Beginning balance at Dec. 31, 2017	$ (714.7)	$ 189.7	$ 2,291.2	$ 2,320.3	$ (926.2)	$ (4,600.0)	$ 10.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(21.1)			(20.3)			(0.8)
Other comprehensive income (loss)	35.6				35.2		0.4
Dividends accrued - Series C convertible preferred stock	(6.0)			(6.0)
Exercise/ vesting/ expense of share-based compensation (in shares)		2,200,000				(100,000)
Exercise/ vesting/ expense of share-based compensation	$ 3.6	$ 0.6	2.5	(0.4)		$ 0.9
Repurchase of common stock (in shares)	900,000					900,000
Repurchase of common stock	$ (2.7)					$ (2.7)
Purchases and sales of noncontrolling interests, net of dividends paid	(0.2)						(0.2)
Ending balance (in shares) at Mar. 31, 2018		760,900,000				319,200,000
Ending balance at Mar. 31, 2018	(746.6)	$ 190.3	2,293.7	2,252.5	(891.0)	$ (4,601.8)	9.7
Beginning balance (in shares) at Dec. 31, 2018		761,800,000				319,400,000
Beginning balance at Dec. 31, 2018	(896.8)	$ 190.3	2,303.6	2,234.3	(1,030.4)	$ (4,602.3)	7.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(33.5)			(32.7)			(0.8)
Other comprehensive income (loss)	(3.9)				(4.0)		0.1
Dividends accrued - Series C convertible preferred stock	(6.2)			(6.2)
Exercise/ vesting/ expense of share-based compensation (in shares)		1,300,000
Exercise/ vesting/ expense of share-based compensation	$ (1.2)	$ 0.3	(1.5)
Repurchase of common stock (in shares)	0
Purchases and sales of noncontrolling interests, net of dividends paid	$ 0.1						0.1
Ending balance (in shares) at Mar. 31, 2019		763,100,000				319,400,000
Ending balance at Mar. 31, 2019	$ (941.5)	$ 190.6	$ 2,302.1	$ 2,195.4	$ (1,034.4)	$ (4,602.3)	$ 7.1