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		27.4
Stock Issued During Period, Value, Employee Stock Purchase Plan		8.1
Stock Repurchased During Period, Value		(361.2)
Net Income	298.1		298.1
Other Comprehensive Income (Loss), Net of Tax	(0.1)			(0.1)
Stockholders' Deficit	(1,403.8)	14,111.2	(15,512.2)	(2.8)
Stock-based compensation expense		14.1
Stock Issued During Period, Value, Employee Stock Purchase Plan		0.0
Stock Repurchased During Period, Value		(175.8)
Net Income			147.7
Other Comprehensive Income (Loss), Net of Tax	(0.1)			(0.1)
Stockholders' Deficit	(1,417.9)	13,949.5	(15,364.5)	(2.9)
Stockholders' Deficit	(1,260.5)	13,620.1	(14,877.8)	(2.8)
Stock-based compensation expense		28.7
Stock Issued During Period, Value, Employee Stock Purchase Plan		8.2
Stock Repurchased During Period, Value		(556.1)
Net Income	324.8		324.8
Other Comprehensive Income (Loss), Net of Tax	(0.1)			(0.1)
Stockholders' Deficit	(1,285.1)	13,438.2	(14,720.3)	(3.0)
Stock-based compensation expense		14.2
Stock Issued During Period, Value, Employee Stock Purchase Plan		0.0
Stock Repurchased During Period, Value		(351.5)
Net Income			167.3
Other Comprehensive Income (Loss), Net of Tax	0.1			0.1
Stockholders' Deficit	$ (1,455.0)	$ 13,100.9	$ (14,553.0)	$ (2.9)