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	$ (1,260.5)	$ 13,620.1	$ (14,877.8)	$ (2.8)
Stock-based compensation expense		45.4
Stock Issued During Period, Value, Employee Stock Purchase Plan		12.3
Excise tax on repurchase of common stock	0.0
Stock Repurchased During Period, Value		(834.0)
Net Income	494.3		494.3
Other Comprehensive Income (Loss), Net of Tax	0.1			0.1
Stockholders' Deficit	(1,455.0)	13,100.9	(14,553.0)	(2.9)
Stock-based compensation expense		16.7
Stock Issued During Period, Value, Employee Stock Purchase Plan		4.1
Excise tax on repurchase of common stock	0.0
Stock Repurchased During Period, Value		(277.9)
Net Income			169.5
Other Comprehensive Income (Loss), Net of Tax	0.2			0.2
Stockholders' Deficit	(1,542.4)	12,843.8	(14,383.5)	(2.7)
Stockholders' Deficit	(1,562.2)	12,644.5	(14,204.0)	(2.7)
Stock-based compensation expense		45.8
Stock Issued During Period, Value, Employee Stock Purchase Plan		12.3
Excise tax on repurchase of common stock	(6.1)
Stock Repurchased During Period, Value		(675.8)
Net Income	552.9		552.9
Other Comprehensive Income (Loss), Net of Tax	(0.3)			(0.3)
Stockholders' Deficit	(1,617.9)	12,225.1	(13,839.6)	(3.4)
Stock-based compensation expense		15.8
Stock Issued During Period, Value, Employee Stock Purchase Plan		4.3
Excise tax on repurchase of common stock	(2.1)
Stock Repurchased During Period, Value		(222.4)
Net Income			188.5
Other Comprehensive Income (Loss), Net of Tax	0.4			0.4
Stockholders' Deficit	$ (1,633.4)	$ 12,020.7	$ (13,651.1)	$ (3.0)