CONDENSED CONSOLIDATED STATEMENT 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)			(2.0)
Stockholders' Equity	$ 3,797.9		$ 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	58.4		$ (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	[1]	$ 0.0	$ 0.0	0.0	0.0	1.2	1.2
Common Stock, Shares			239.8
Treasury Stock, Shares	(3.0)			(3.0)
Stockholders' Equity	$ 3,374.9		$ 2.4	$ (44.2)	$ 1,424.6	$ 2,002.0	$ (9.9)	$ 3,374.9

[1] Presented net of income tax expense of $1.0 million during the nine months ended September 30, 2017.