Commitments and Contingencies Commitments and Contingencies, Environmental Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 22.0	$ 20.2	$ 9.7
Additional accruals	1.2	3.9	13.9
Less expenditures	1.5	2.1	3.4
Ending balance	21.7	22.0	20.2
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity [Abstract]
Environmental accrual	21.7	22.0	20.2
Expected period related to remediation expenditures for environmental contingencies	30 years
Environmental contingency loss exposure in excess of current accrual	$ 18.7
Expected period related to excess environmental costs over current accruals	30 years
Time period within which Company's recorded estimate of its obligation may change	12 months