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	$ (1,390.2)	$ 14,275.2	$ (15,662.6)	$ (2.8)
Stock-based compensation expense		42.3
Stock Issued During Period, Value, Employee Stock Purchase Plan		12.4
Stock Repurchased During Period, Value		(536.8)
Net Income	454.7		454.7
Other Comprehensive Income (Loss), Net of Tax	0.0			0.0
Stockholders' Deficit	(1,417.9)	13,949.5	(15,364.5)	(2.9)
Stock-based compensation expense		14.9
Stock Issued During Period, Value, Employee Stock Purchase Plan		4.3
Stock Repurchased During Period, Value		(175.6)
Net Income			156.6
Other Comprehensive Income (Loss), Net of Tax	0.1			0.1
Stockholders' Deficit	(1,417.6)	13,793.1	(15,207.9)	(2.8)
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
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
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)