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Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) Reclassifications out of AOCI (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | $ 0.3 | $ 0 | $ 0.2 | $ (1.6)
Amounts Reclassified from accumulated other comprehensive income (loss) | (0.3) | 0 | (0.2) | 3.6
Amounts Reclassified from Accumulated OCI, Net of Tax and Noncontrolling Interest | (1.4) |  | (3.3) |
Commodity Contract [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (0.6) |  | (0.4) |
Interest Rate Swap [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (0.1) |  | (0.3) |
Derivative [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (0.7) |  | (0.7) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | (0.3) |  | (0.3) |
Amounts Reclassified from accumulated other comprehensive income (loss) | (0.4) |  | (0.4) |
Postretirement Benefit Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax | (0.9) |  | (2.5) |
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax | 0.8 |  | 2.2 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax | (0.1) |  | (0.3) |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax | 0 |  | (0.1) |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.1) |  | (0.2) |
Pension Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax | (1.5) |  | (4.6) |
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax | 0 |  | 0 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax | (1.5) |  | (4.6) |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax | (0.6) |  | (1.8) |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.9) |  | (2.8) |
Amortization of Defined Benefit Pension Items, Amount Reclassified from Accumulated OCI, Noncontrolling Interest | 0 |  | (0.1) |
Amounts Reclassified from Accumulated OCI, Net of Tax and Noncontrolling Interest | $ (0.9) |  | $ (2.7) |

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