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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ (5.3) | $ (0.7) | $ (5.7) | $ (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] | (1.1) | (1.4) | (2.3) | (2.6)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Settlement Cost, before Tax | [1] | (8.2) | 0.0 | (8.2) | 0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | (9.3) | (1.4) | (10.5) | (2.6)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | (3.6) | (0.6) | (4.0) | (1.4)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (5.7) | (0.8) | (6.5) | (1.2)
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] | 0.0 | (0.6) | 0.0 | (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 | 0.7 | 1.3 | 1.4
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | 0.7 | 0.1 | 1.3 | 0.4
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | 0.3 | 0.0 | 0.5 | 0.1
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ 0.4 | $ 0.1 | $ 0.8 | $ 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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