CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock, Value [Member]	Stockholders' Equity, Total	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Other Comprehensive Income (Loss) [Member]	Total [Member]
Common Stock, Shares		243.0
Treasury Stock, Shares				(2.0)
Stockholders' Equity		$ 2.4		$ (34.2)	$ 1,398.2	$ 2,442.6	$ (11.1)	$ 3,797.9
Net income (loss)	$ (389.6)
Net income (loss), Shares		0.0		0.0
Net income (loss)	(389.6)	$ 0.0		$ 0.0	0.0	(389.6)	0.0	(389.6)
Common stock repurchased and retired, Shares		(6.2)		0.0
Common stock repurchased and retired	58.4	$ (0.1)	$ (58.4)	$ 0.0	0.0	(58.3)	0.0
Share-based compensation, Shares		2.9
Share-based compensation		$ 0.1
Stock Issued During Period, Shares, Treasury Stock Reissued				(0.7)
Share-based compensation				$ (7.0)	17.5	0.0	0.0	10.6
Stock Issued During Period, Shares, Employee Benefit Plan		0.0		0.0
Change in pension and postretirement liability, net of tax		$ 0.0		$ 0.0	0.0	0.0	0.9	0.9
Common Stock, Shares		240.3
Treasury Stock, Shares				(2.6)
Stockholders' Equity		$ 2.4		$ (39.5)	1,408.0	2,336.3	(10.5)	3,696.7
Net income (loss), Shares		0.0		0.0
Net income (loss)	$ (336.0)	$ 0.0		$ 0.0	0.0	(336.0)	0.0	(336.0)
Common stock repurchased and retired, Shares		(0.6)		0.0
Common stock repurchased and retired		$ 0.0	$ (5.6)	$ 0.0	0.0	(5.6)	0.0
Share-based compensation, Shares		0.0
Share-based compensation		$ 0.0
Stock Issued During Period, Shares, Treasury Stock Reissued				(0.1)
Share-based compensation				$ (1.7)	7.7	0.0	0.0	6.0
Stock Issued During Period, Shares, Employee Benefit Plan		0.0		0.0
Change in pension and postretirement liability, net of tax		$ 0.0		$ 0.0	0.0	0.0	0.3	0.3
Common Stock, Shares		239.7
Treasury Stock, Shares				(2.7)
Stockholders' Equity		$ 2.4		$ (41.2)	1,415.7	1,994.7	(10.2)	3,361.4
Common Stock, Shares		239.8
Treasury Stock, Shares	(3.1)			(3.1)
Stockholders' Equity	$ 2,750.9	$ 2.4		$ (45.6)	1,431.9	1,376.5	(14.3)	2,750.9
Net income (loss), Shares		0.0		0.0
Net income (loss)	(67.9)	$ 0.0		$ 0.0	0.0	(67.9)	0.0	(67.9)
Common stock repurchased and retired	0.0
Share-based compensation, Shares		2.2
Share-based compensation		$ 0.0
Stock Issued During Period, Shares, Treasury Stock Reissued				(1.0)
Share-based compensation				$ (8.0)	14.4	0.0	0.0	6.4
Stock Issued During Period, Shares, Employee Benefit Plan		0.0		0.0
Change in pension and postretirement liability, net of tax		$ 0.0		$ 0.0	0.0	0.0	(0.1)	(0.1)
Common Stock, Shares		242.0
Treasury Stock, Shares				(3.9)
Stockholders' Equity		$ 2.4		$ (51.8)	1,440.2	1,259.8	(14.5)	2,636.1
Net income (loss), Shares		0.0		0.0
Net income (loss)	$ 48.8	$ 0.0		$ 0.0	0.0	48.8	0.0	48.8
Share-based compensation, Shares		0.0
Share-based compensation		$ 0.0
Stock Issued During Period, Shares, Treasury Stock Reissued				(0.2)
Share-based compensation				$ (1.8)	6.1	0.0	0.0	4.3
Stock Issued During Period, Shares, Employee Benefit Plan		0.0		0.0
Change in pension and postretirement liability, net of tax		$ 0.0		$ 0.0	0.0	0.0	0.1	0.1
Common Stock, Shares		242.0
Treasury Stock, Shares	(4.1)			(4.1)
Stockholders' Equity	$ 2,689.3	$ 2.4		$ (53.6)	$ 1,446.3	$ 1,308.6	$ (14.4)	$ 2,689.3