Contingencies (Details) $ in Millions	1 Months Ended
	Mar. 31, 2016 Party mi	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss, Area of Land | mi	8.3
Loss Contingency, Estimate of Possible Loss		$ 1,380.0
Loss Contingency, Number of Parties | Party	100
Insurance Environmental and Litigation Matters [Member]
Loss Contingencies [Line Items]
Reserves for insurance, environmental and litigation contingencies		54.9	$ 51.9
Insurance Settlements Receivable, Noncurrent		$ 15.9	$ 15.9