Lawsuits, Claims, Commitments, Contingencies and Related Matters (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Reserves for environmental remediation obligations	$ 5.1
Accrued liabilities	$ 368.3	$ 347.2	$ 345.3
Accrual for environmental loss contingencies			$ 5.1
Maximum
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Estimated duration of remediation	30 years
Environmental Reserves
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Accrued liabilities	$ 1.3