Environmental (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Environmental remediation costs	$ 14.7	$ 28.5	$ 13.2
Accrued environmental liability	98.1	104.5
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Accrued environmental liability	$ 83.5	$ 81.8