Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Environmental remediation liabilities - discounted	$ 24.5	$ 22.8
Accrual for environmental loss contingencies - weighted-average discount rate	3.60%
Environmental remediation liabilities - undiscounted	$ 63.6	61.1
Potential revision on future environmental remediation costs before tax	18.0
Tax indemnification liability	$ 42.8	$ 38.2