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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ (0.4) | $ (4.4) | $ (6.1) | $ (5.3)
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] | (1.2) | (1.0) | (3.5) | (3.6)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Settlement Cost, before Tax | [1] | 0.0 | (6.2) | (8.2) | (6.2)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | (1.2) | (7.2) | (11.7) | (9.8)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | (0.4) | (2.7) | (4.4) | (4.1)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (0.8) | (4.5) | (7.3) | (5.7)
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 | (0.5) | 0.0 | (1.5)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax | [1] | 0.6 | 0.7 | 1.9 | 2.1
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | 0.6 | 0.2 | 1.9 | 0.6
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | 0.2 | 0.1 | 0.7 | 0.2
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ 0.4 | $ 0.1 | $ 1.2 | $ 0.4
[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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