Environmental Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Accrual for Environmental Loss Contingencies [Roll Forward]
Environmental reserves, long-term			$ 450.0	$ 470.5
Environmental loss contingencies, net of expected recoveries, in excess of accrual	$ 150.0
Recorded Recoveries [Roll Forward]
Payment to FMC	20.0
Environmental charges, net	6.4	$ 2.6
Environmental provision, net	8.8	2.4
Continuing Operations
Recorded Recoveries [Roll Forward]
Environmental charges, net	6.4	2.6
Discontinued Operations
Recorded Recoveries [Roll Forward]
Environmental charges, net	2.4	(0.2)
Other Assets Including Long-term Receivables, Net
Recorded Recoveries [Roll Forward]
Environmental Recoveries, beginning	27.3
Increase (Decrease) in recoveries	(3.5)
Cash received	(20.1)
Environmental Recoveries, ending	3.7
Other Liabilities
Recorded Recoveries [Roll Forward]
Environmental remediation provision, net	5.3	2.5
Other Assets
Recorded Recoveries [Roll Forward]
Environmental remediation provision, net	3.5	$ (0.1)
Gross
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2019	595.8
Provision (Benefit)	5.6
(Spending) Recoveries	(15.2)
Foreign currency translation adjustments	(0.4)
Net change	(10.0)
Total environmental reserves at March 31, 2020	585.8
Environmental reserves, current			127.3
Environmental reserves, long-term			458.5
Total environmental reserves, net of recoveries at end of period	585.8		585.8	595.8
Recoveries
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2019	10.0
Provision (Benefit)	(0.3)
(Spending) Recoveries	0.6
Net change	0.3
Total environmental reserves at March 31, 2020	9.7
Environmental reserves, current			1.2
Environmental reserves, long-term			8.5
Total environmental reserves, net of recoveries at end of period	9.7		9.7	10.0
Net
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves at December 31, 2019	585.8
Provision (Benefit)	5.3
(Spending) Recoveries	(14.6)
Foreign currency translation adjustments	(0.4)
Net change	(9.7)
Total environmental reserves at March 31, 2020	576.1
Environmental reserves, current			126.1
Environmental reserves, long-term			450.0
Total environmental reserves, net of recoveries at end of period	$ 576.1		$ 576.1	$ 585.8