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Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive (income) loss | $ (23.2) | $ (29.3) | $ (35.1)
Other comprehensive income before reclassifications | 6.1 | (0.5) |
Amounts reclassified from accumulated other comprehensive income (loss) | (2.5) | (2.8) | (2.5)
Amounts reclassified from accumulated other comprehensive income (loss) | 1.8 | 1.3 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 22.3 |  |
Net current period other comprehensive income (loss) | 6.1 | 5.8 |
Amounts Reclassified from Accumulated OCI, Net of Tax and Noncontrolling Interest | 4.5 | 6.3 |
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | (1.5) |  |
Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (4.6) | (7.8) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (3.9) | (4.5) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 0.1 | 0.0 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Settlement Cost, before Tax | (3.6) | (8.2) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | (7.4) | (12.7) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | (2.8) | (4.9) |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Other comprehensive income before reclassifications |  | 0.0 |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.1 | 1.5 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 0.9 | 2.5 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Settlement Cost, before Tax | (0.7) |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 0.2 | 2.5 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 0.1 | 1.0 |
Defined Benefit Plans Income Loss [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | (32.7) | (32.1) | (39.2)
Other comprehensive income before reclassifications | 0.4 | (0.7) |
Amounts reclassified from accumulated other comprehensive income (loss) | 2.5 | 2.8 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (5.7) |  |
Net current period other comprehensive income (loss) | (0.6) | 7.1 |
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | (3.7) |  |
Defined Benefit Plans Income Loss [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | 2.5 | 2.7 | 2.5
Other comprehensive income before reclassifications | (0.6) | 0.2 |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (0.1) |  |
Net current period other comprehensive income (loss) | (0.2) | 0.2 |
AOCI Attributable to Parent [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (4.5) |  |
Defined Benefit Plan Prior Service Cost [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | 0.0 | 0.1 | 0.1
Other comprehensive income before reclassifications | 0.0 | 0.0 |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.1) | 0.0 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 0.0 |  |
Net current period other comprehensive income (loss) | (0.1) | 0.0 |
Defined Benefit Plan Prior Service Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | 7.0 | 0.0 | $ 1.5
Other comprehensive income before reclassifications | 6.3 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.6) | (1.5) |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 1.3 |  |
Net current period other comprehensive income (loss) | 7.0 | (1.5) |
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 2.3 |  |
Settlement Cost [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 2.7 | 5.0 |
Settlement Cost [Member] | Defined Benefit Plans Income Loss [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 2.2 | 5.0 |
Settlement Cost [Member] | Defined Benefit Plans Income Loss [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.5 | 0.0 |
Settlement Cost [Member] | Defined Benefit Plan Prior Service Cost [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0 |
Settlement Cost [Member] | Defined Benefit Plan Prior Service Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | $ 0.0 |
Defined Benefit Plan Prior Service Cost [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | $ (0.1) |  |

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