Condensed Consolidated Statements of Stockholders' Deficit Statement - USD ($) $ in Millions	Total	Common Stock Including Additional Paid in Capital [Member]	Accumulated Deficit [Member]	AOCI Attributable to Parent [Member]
Stockholders' Deficit	$ (1,957.9)	$ 10,645.3	$ (12,600.7)	$ (2.5)
Stock Repurchased During Period, Value		(241.7)
Dividends, Common Stock, Cash		0.0
Stock-based compensation expense		17.7
Stock Issued During Period, Value, Employee Stock Purchase Plan		7.9
Excise tax on repurchase of common stock	(2.0)
Net Income	199.3		199.3
Other Comprehensive Income (Loss), Net of Tax	$ (0.3)			(0.3)
Common Stock, Dividends, Per Share, Cash Paid	$ 0
Stockholders' Deficit	$ (1,977.0)	10,427.2	(12,401.4)	(2.8)
Stockholders' Deficit	(2,154.2)	9,623.5	(11,775.0)	(2.7)
Stock Repurchased During Period, Value		(225.4)
Dividends, Common Stock, Cash		(74.2)
Stock-based compensation expense		19.3
Stock Issued During Period, Value, Employee Stock Purchase Plan		8.5
Excise tax on repurchase of common stock	(1.8)
Net Income	214.5		214.5
Other Comprehensive Income (Loss), Net of Tax	$ (0.1)			(0.1)
Common Stock, Dividends, Per Share, Cash Paid	$ 0.81
Stockholders' Deficit	$ (2,213.4)	$ 9,349.9	$ (11,560.5)	$ (2.8)