Environmental (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Environmental remediation costs	$ 28.5	$ 13.2	$ 46.1
Accrued environmental liability	104.5	87.8
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Accrued environmental liability	$ 81.8	$ 73.6