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Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) Reclassifications out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ (4.4) | $ (0.3) | $ (5.3) | $ (0.9)
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] | (1.0) | (0.8) | (3.6) | (2.3)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Settlement Cost, before Tax | [1] | (6.2) | 0.0 | (6.2) | 0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | (7.2) | (0.8) | (9.8) | (2.3)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | (2.7) | (0.3) | (4.1) | (0.9)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (4.5) | (0.5) | (5.7) | (1.4)
Other 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 | [1] | (0.5) | (0.2) | (1.5) | (1.0)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax | [1] | 0.7 | 0.6 | 2.1 | 2.1
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | 0.2 | 0.4 | 0.6 | 1.1
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | 0.1 | 0.1 | 0.2 | 0.4
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | 0.1 | 0.3 | 0.4 | 0.7
Derivative [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  | 0.0 | (0.1) | 0.0 | (0.3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  | 0.0 | 0.0 | 0.0 | (0.1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | 0.0 | (0.1) | 0.0 | (0.2)
Interest Expense [Member] | Interest Rate Swap [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  | $ 0.0 | $ (0.1) | $ 0.0 | $ (0.3)
[1] | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 10 for additional information).

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