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]
Stockholders' Equity	$ 2,750.9	$ 2.4	$ (45.6)	$ 1,431.9	$ 1,376.5	$ (14.3)
Common Stock, Shares		239.8
Treasury Stock, Shares			(3.1)
Stockholders' Equity	2,689.3	$ 2.4	$ (53.6)	1,446.3	1,308.6	(14.4)
Net income (loss)	(67.9)				(67.9)
Share-based compensation, Shares		2.2
Share-based compensation	6.4	$ 0.0	$ 8.0	14.4
Shares Paid for Tax Withholding for Share Based Compensation			(1.0)
Change in pension and postretirement liability, net of tax	(0.1)					(0.1)
Stockholders' Equity at Jun. 30, 2019	2,689.3	2.4	$ (53.6)	1,446.3	1,308.6	(14.4)
Stockholders' Equity	2,636.1	$ 2.4	$ (51.8)	1,440.2	1,259.8	(14.5)
Common Stock, Shares		242.0
Treasury Stock, Shares			(3.9)
Stockholders' Equity	2,689.3	$ 2.4	$ (53.6)	1,446.3	1,308.6	(14.4)
Net income (loss)	48.8				48.8
Share-based compensation	4.3		$ 1.8	6.1
Shares Paid for Tax Withholding for Share Based Compensation			(0.2)
Change in pension and postretirement liability, net of tax	0.1					0.1
Stockholders' Equity at Jun. 30, 2019	2,689.3	2.4	$ (53.6)	1,446.3	1,308.6	(14.4)
Stockholders' Equity	2,689.3	$ 2.4	$ (53.6)	1,446.3	1,308.6	(14.4)
Common Stock, Shares		242.0
Treasury Stock, Shares			(4.1)
Stockholders' Equity	$ 2,660.6	$ 2.4	$ (55.4)	1,456.5	1,269.6	(12.5)
Common Stock, Shares		242.1
Treasury Stock, Shares	(4.4)		(4.4)
Stockholders' Equity	$ 2,844.9	$ 2.5	$ (56.6)	1,463.3	1,447.8	(12.1)
Net income (loss)	183.0				183.0
Cash dividends paid, $0.02 per share	(4.8)				(4.8)
Share-based compensation, Shares		5.1
Share-based compensation	5.7	$ 0.1	$ (1.2)	6.8	0.0	0.0
Shares Paid for Tax Withholding for Share Based Compensation			(0.5)
Change in pension and postretirement liability, net of tax	0.4					0.4
Stockholders' Equity at Jun. 30, 2020	2,844.9	2.5	$ (56.6)	1,463.3	1,447.8	(12.1)
Stockholders' Equity	3,026.0	$ 2.5	$ (56.2)	1,459.9	1,632.2	(12.4)
Common Stock, Shares		247.0
Treasury Stock, Shares			(4.8)
Stockholders' Equity	2,844.9	$ 2.5	$ (56.6)	1,463.3	1,447.8	(12.1)
Net income (loss)	(184.4)				(184.4)
Share-based compensation, Shares		0.2
Share-based compensation	3.0		$ (0.4)	3.4
Shares Paid for Tax Withholding for Share Based Compensation			(0.1)
Change in pension and postretirement liability, net of tax	0.3					0.3
Stockholders' Equity at Jun. 30, 2020	2,844.9	$ 2.5	$ (56.6)	1,463.3	1,447.8	(12.1)
Stockholders' Equity	$ 2,844.9	$ 2.5	$ (56.6)	$ 1,463.3	$ 1,447.8	$ (12.1)
Common Stock, Shares		247.2
Treasury Stock, Shares	(4.9)		(4.9)