Commitments and Contingencies - Schedule of Environmental Remediation Reserve Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Environmental remediation reserve activity
Beginning remediation accrual balance	$ 5.0	$ 3.9	$ 6.6
Current period expenses	0.5	6.0	0.9
Cash expenditures	(2.6)	(4.9)	(3.6)
Ending remediation accrual balance	2.9	5.0	3.9
Capital expenditures for environmental matters	$ 7.1	$ 7.3	$ 4.6