Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (USD $) In Millions	Total	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests
Balance at beginning of period at Dec. 31, 2013	$ 468.7	$ 1.0	$ 2,849.4	$ (2,101.1)	$ (0.1)	$ (404.6)	$ 124.1
Balance at beginning of period, Shares at Dec. 31, 2013		88.0
Net income	46.7			46.7
Net income attributable to nonredeemable noncontrolling interest	12.8						12.8
Net income, including portion attributable to nonredeemable noncontrolling interest, total	59.5
Receipt of treasury stock	(9.2)					(9.2)
Receipt of treasury stock, Shares		(0.3)
Dividends declared on common stock	(16.0)		(16.0)
Dividends declared on convertible perpetual preferred stock	(1.6)		(1.6)
Stock-based compensation	7.3		7.3
Stock options exercised	3.6		3.6
Stock options exercised, Shares		0.1
Stock warrants exercised	6.3		6.3
Stock warrants exercised, Shares		0.2
Distributions declared	(10.3)						(10.3)
Repurchases of common stock	(26.3)					(26.3)
Repurchases of common stock, Shares		(0.8)
Other	0.2		0.3		0.1	(0.2)
Other, Shares		0.9
Balance at end of period at Mar. 31, 2014	482.2	1.0	2,849.3	(2,054.4)	0	(440.3)	126.6
Balance at end of period, Shares at Mar. 31, 2014		88.1
Balance at beginning of period at Dec. 31, 2014	619.5	1.0	2,810.5	(1,879.1)	(0.5)	(458.7)	146.3
Balance at beginning of period, Shares at Dec. 31, 2014		87.8
Net income	42.5			42.5
Net income attributable to nonredeemable noncontrolling interest	13.6						13.6
Net income, including portion attributable to nonredeemable noncontrolling interest, total	56.1
Receipt of treasury stock	(14.9)					(14.9)
Receipt of treasury stock, Shares		(0.5)
Dividends declared on common stock	(18.7)		(18.7)
Dividends declared on convertible perpetual preferred stock	(1.6)		(1.6)
Stock-based compensation	9.1		9.1
Stock options exercised	1.9		5.5			(3.6)
Stock options exercised, Shares		0.2
Distributions declared	(12.4)						(12.4)
Other	1.4		0.8		0.1	(0.1)	0.6
Other, Shares		0.7
Balance at end of period at Mar. 31, 2015	$ 640.4	$ 1.0	$ 2,805.6	$ (1,836.6)	$ (0.4)	$ (477.3)	$ 148.1
Balance at end of period, Shares at Mar. 31, 2015		88.2