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Postretirement Benefits Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in Plan Assets [Roll Forward] |  |  |  |
Funded Percentage | [1] | 38.00% | 98.00% |
Pension Plans [Member] |  |  |  |
Change in Benefit Obligations [Roll Forward] |  |  |  |
Benefit Obligation at Previous December 31 |  | $ 652.8 | $ 716.9 |
Interest Cost |  | 6.0 | 22.6 | $ 28.4
Participant Contributions |  | 0.0 | 0.0 |
Actuarial (Gains) Losses |  | 77.3 | (42.9) |
Benefit Payments |  | (34.1) | (43.8) |
Settlement Payments |  | (673.9) | 0.0 |
Benefit Obligation at December 31 |  | 28.1 | 652.8 | 716.9
Change in Plan Assets [Roll Forward] |  |  |  |
Fair Value of Plan Assets at Previous December 31 |  | 642.0 | 546.1 |
Actual Return on Plan Assets |  | 70.8 | (24.1) |
Employer Contributions |  | 7.9 | 163.8 |
Participant Contributions |  | 0.0 | 0.0 |
Benefit Payments |  | (34.1) | (43.8) |
Settlement Payments |  | (673.9) | 0.0 |
Defined Benefit Plan, Plan Assets, Adjustments |  | (2.1) | 0.0 |
Fair Value of Plan Assets at December 31 |  | 10.6 | 642.0 | 546.1
Funded Status at December 31 |  | (17.5) | (10.8) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Asset, Defined Benefit Plan, Prepaid Expenses and Other |  | 0.0 | 14.8 |
Assets, Defined Benefit Plan, Accounts and Notes Receivable |  | 10.6 | 3.6 |
Assets for Plan Benefits, Defined Benefit Plan |  | 10.6 | 18.4 |
Liability, Defined Benefit Plan, Current |  | 3.5 | 3.7 |
Liability, Defined Benefit Plan, Noncurrent |  | 24.6 | 25.5 |
Liability, Defined Benefit Plan |  | 28.1 | 29.2 |
Other Postretirement Benefit Plans [Member] |  |  |  |
Change in Benefit Obligations [Roll Forward] |  |  |  |
Benefit Obligation at Previous December 31 |  | 34.3 | 38.7 |
Interest Cost |  | 1.3 | 1.1 | 1.2
Participant Contributions |  | 0.0 | 0.2 |
Actuarial (Gains) Losses |  | 0.2 | (2.5) |
Benefit Payments |  | (2.8) | (3.2) |
Settlement Payments |  | 0.0 | 0.0 |
Benefit Obligation at December 31 |  | 33.0 | 34.3 | 38.7
Change in Plan Assets [Roll Forward] |  |  |  |
Fair Value of Plan Assets at Previous December 31 |  | 0.0 | 0.0 |
Actual Return on Plan Assets |  | 0.0 | 0.0 |
Employer Contributions |  | 2.8 | 3.0 |
Participant Contributions |  | 0.0 | 0.2 |
Benefit Payments |  | (2.8) | (3.2) |
Settlement Payments |  | 0.0 | 0.0 |
Defined Benefit Plan, Plan Assets, Adjustments |  | 0.0 | 0.0 |
Fair Value of Plan Assets at December 31 |  | 0.0 | 0.0 | $ 0.0
Funded Status at December 31 |  | (33.0) | (34.3) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |  |
Asset, Defined Benefit Plan, Prepaid Expenses and Other |  | 0.0 | 0.0 |
Assets, Defined Benefit Plan, Accounts and Notes Receivable |  | 0.0 | 0.0 |
Assets for Plan Benefits, Defined Benefit Plan |  | 0.0 | 0.0 |
Liability, Defined Benefit Plan, Current |  | 3.6 | 3.6 |
Liability, Defined Benefit Plan, Noncurrent |  | 29.4 | 30.7 |
Liability, Defined Benefit Plan |  | 33.0 | 34.3 |
Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 28.1 | 29.2 |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | $ 28.1 | $ 29.2 |
[1] | (A) As all of the Company's plans are frozen, the projected benefit obligation and the accumulated benefit obligation are equal. As of December 31, 2018, the plan assets for the Company's Salaried and Bargaining plans were in excess of the projected and accumulated benefit obligations

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