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Commitments and Contingencies Commitments and Contingencies, Environmental Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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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 |  |

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