Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Common Stock	Treasury Stock	Additional Paid-in	Accumulated Deficit	Noncontrolling Interest	Parent	Total
Balance at Dec. 31, 2013	$ 0.2	$ (3.5)	$ 1,457.5	$ (70.9)		$ 1,383.3	$ 1,383.3
Balance (in shares) at Dec. 31, 2013	75.5	(0.2)
Increase (Decrease) in Stockholders' Equity
Stock issued upon exercise of stock options and stock grants			11.1			11.1	11.1
Stock issued upon exercise of stock options and stock grants (in shares)	0.6
Surrender of common stock to cover employees' minimum tax liability for vested awards		$ (1.5)	(2.5)			(4.0)	(4.0)
Stock-based compensation expense, net of forfeitures			18.9			18.9	18.9
Repurchases of common stock		$ (75.1)				(75.1)	(75.1)
Repurchases of common stock (in shares)		(2.7)
Preferred stock dividends			(4.0)			(4.0)	(4.0)
Noncontrolling interest					$ 1.8		1.8
Tax benefit associated with share-based awards			3.0			3.0	3.0
Net income				18.5		18.5	18.5
Balance at Dec. 31, 2014	$ 0.2	$ (80.1)	1,484.0	(52.4)	1.8	1,351.7	1,353.5
Balance (in shares) at Dec. 31, 2014	76.1	(2.9)
Increase (Decrease) in Stockholders' Equity
Stock issued upon exercise of stock options and stock grants			5.6			5.6	5.6
Stock issued upon exercise of stock options and stock grants (in shares)	0.5
Surrender of common stock to cover employees' minimum tax liability for vested awards		$ (1.2)	(2.9)			(4.1)	(4.1)
Stock-based compensation expense, net of forfeitures			19.6			19.6	19.6
Repurchases of common stock		$ (144.5)				(144.5)	(144.5)
Repurchases of common stock (in shares)		(6.3)
Preferred stock dividends			(4.0)			(4.0)	(4.0)
Noncontrolling interest					$ (1.8)		(1.8)
Tax benefit associated with share-based awards			0.5			0.5	0.5
Net income				23.3		23.3	23.3
Balance at Dec. 31, 2015	$ 0.2	$ (225.8)	1,502.8	(29.1)		1,248.1	1,248.1
Balance (in shares) at Dec. 31, 2015	76.6	(9.2)
Increase (Decrease) in Stockholders' Equity
Stock issued upon exercise of stock options and stock grants			3.2			3.2	3.2
Stock issued upon exercise of stock options and stock grants (in shares)	0.4
Surrender of common stock to cover employees' minimum tax liability for vested awards		$ (0.5)	(1.9)			(2.4)	(2.4)
Stock-based compensation expense, net of forfeitures			19.1			19.1	19.1
Repurchases of common stock		$ (115.7)				(115.7)	(115.7)
Repurchases of common stock (in shares)		(6.4)
Preferred stock dividends			(3.0)	(1.0)		(4.0)	(4.0)
Tax benefit associated with share-based awards			(1.9)			(1.9)	(1.9)
Net income				26.5		26.5	26.5
Balance at Dec. 31, 2016	$ 0.2	$ (342.0)	$ 1,518.3	$ (3.6)		$ 1,172.9	$ 1,172.9
Balance (in shares) at Dec. 31, 2016	77.0	(15.6)