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Environmental Obligations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]
Environmental reserves, long-term					$ 310.0	$ 346.2
Environmental loss contingencies, net of expected recoveries, in excess of accrual			$ 210.0
Recorded Recoveries [Roll Forward]
Environmental charges, net	$ 2.4	$ 2.7	9.2	$ 8.3
Environmental provision, net	7.4	31.9	20.6	52.7
Continuing Operations
Recorded Recoveries [Roll Forward]
Environmental charges, net	2.4	2.7	9.2	8.3
Discontinued Operations
Recorded Recoveries [Roll Forward]
Environmental charges, net	5.0	29.2	11.4	44.4
Other Assets Including Long-term Receivables, Net
Recorded Recoveries [Roll Forward]
Environmental Recoveries, beginning			32.3
Increase in recoveries			0.4
Cash received			(4.2)
Environmental Recoveries, ending	28.5		28.5
Other Liabilities
Recorded Recoveries [Roll Forward]
Environmental remediation provision, net	7.8	31.9	21.0	53.1
Other Assets
Recorded Recoveries [Roll Forward]
Environmental remediation provision, net	(0.4)	$ 0.0	(0.4)	$ (0.4)
Gross
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2017			432.1
Provision (Benefit)			21.0
(Spending) Recoveries			(31.4)
Foreign currency translation adjustments			(0.9)
Net change			(11.3)
Total environmental reserves at September 30, 2018	420.8		420.8
Environmental reserves, current					98.9
Environmental reserves, long-term					321.9
Total environmental reserves, net of recoveries at end of period	420.8		432.1		420.8	432.1
Recoveries
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2017			13.9
Provision (Benefit)			0.0
(Spending) Recoveries			0.0
Foreign currency translation adjustments			0.0
Net change			0.0
Total environmental reserves at September 30, 2018	13.9		13.9
Environmental reserves, current					2.0
Environmental reserves, long-term					11.9
Total environmental reserves, net of recoveries at end of period	13.9		13.9		13.9	13.9
Net
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2017			418.2
Provision (Benefit)			21.0
(Spending) Recoveries			(31.4)
Foreign currency translation adjustments			(0.9)
Net change			(11.3)
Total environmental reserves at September 30, 2018	406.9		406.9
Environmental reserves, current					96.9
Environmental reserves, long-term					310.0
Total environmental reserves, net of recoveries at end of period	$ 406.9		$ 418.2		$ 406.9	$ 418.2

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