CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock, Value [Member]	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), Shares		0.0	0.0
Net income (loss)	$ (382.3)	$ 0.0	$ 0.0	0.0	(382.3)	0.0	(382.3)
Common stock repurchased and retired, Shares		(6.2)	0.0
Common stock repurchased and retired		$ (0.1)	$ 0.0	0.0	(58.3)	0.0	(58.4)
Share-based compensation, Shares		3.0
Share-based compensation		$ 0.1
Stock Issued During Period, Shares, Treasury Stock Reissued			(1.0)
Share-based compensation			$ (10.0)	26.4	0.0	0.0	16.5
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	1.2	1.2
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
Net income (loss), Shares		0.0	0.0
Net income (loss)	7.3	$ 0.0	$ 0.0	0.0	7.3	0.0	7.3
Common stock repurchased and retired, Shares		0.0	0.0
Common stock repurchased and retired	$ 0.0	$ 0.0	$ 0.0	0.0	0.0	0.0
Share-based compensation, Shares		0.1
Share-based compensation		$ 0.0
Stock Issued During Period, Shares, Treasury Stock Reissued			(0.3)
Share-based compensation			$ (3.0)	8.9	0.0	0.0	5.9
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		239.8
Treasury Stock, Shares			(3.0)
Stockholders' Equity		$ 2.4	$ (44.2)	1,424.6	2,002.0	(9.9)	3,374.9
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)	13.1	$ 0.0	$ 0.0	0.0	13.1	0.0	13.1
Cash dividends declared, $0.02 per share					(4.8)		(4.8)
Share-based compensation, Shares		2.3
Share-based compensation		$ 0.0
Stock Issued During Period, Shares, Treasury Stock Reissued			(1.2)
Share-based compensation			$ (9.2)	20.0	0.0	0.0	10.8
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	0.0	0.0
Common Stock, Shares		242.0
Treasury Stock, Shares			(4.1)
Stockholders' Equity		$ 2.4	$ (53.6)	1,446.3	1,308.6	(14.4)	2,689.3
Net income (loss), Shares		0.0	0.0
Net income (loss)	$ 81.0	$ 0.0	$ 0.0	0.0	81.0	0.0	81.0
Cash dividends declared, $0.02 per share					(4.8)		(4.8)
Share-based compensation, Shares		0.1
Share-based compensation		$ 0.0
Stock Issued During Period, Shares, Treasury Stock Reissued			(0.2)
Share-based compensation			$ (1.2)	5.6	0.0	0.0	4.4
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		242.1
Treasury Stock, Shares	(4.3)		(4.3)
Stockholders' Equity	$ 2,770.0	$ 2.4	$ (54.8)	$ 1,451.9	$ 1,384.8	$ (14.3)	$ 2,770.0