Environmental Obligations - Environmental Reserve Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves, net of recoveries beginning of period	$ 521.5	$ 411.8	$ 360.4
Provision	138.8	178.2	105.6
Spending, net of recoveries	(73.8)	(65.7)	(63.3)
Acquisitions			2.6
Foreign currency translation adjustments	(0.7)	(2.8)	6.5
Net Change	64.3	109.7	51.4
Total environmental reserves, net of recoveries end of period	$ 585.8	$ 521.5	$ 411.8