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Postretirement Benefits Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in Plan Assets [Roll Forward] |  |  |  |
Funded Percentage |  |  | 38.00% |
Pension Plans [Member] |  |  |  |
Change in Benefit Obligations [Roll Forward] |  |  |  |
Benefit Obligation at Previous December 31 | $ 28.1 |  | $ 652.8 |
Interest Cost | 0.7 |  | 6.0 | $ 22.6
Actuarial (Gains) Losses | 2.1 |  | 77.3 |
Benefit Payments | (3.4) |  | (34.1) |
Settlement Payments | 0.0 |  | (673.9) |
Benefit Obligation at December 31 | 27.5 |  | 28.1 | 652.8
Change in Plan Assets [Roll Forward] |  |  |  |
Fair Value of Plan Assets at Previous December 31 | 10.6 |  | 642.0 |
Actual Return on Plan Assets | 0.0 |  | 70.8 |
Employer Contributions | 3.4 |  | 7.9 |
Benefit Payments | (3.4) |  | (34.1) |
Settlement Payments | 0.0 |  | (673.9) |
Defined Benefit Plan, Plan Assets, Adjustments | (10.6) | [1] | (2.1) |
Fair Value of Plan Assets at December 31 | 0.0 |  | 10.6 | 642.0
Funded Status at December 31 | (27.5) |  | (17.5) |
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 |  | 10.6 |
Assets for Plan Benefits, Defined Benefit Plan | 0.0 |  | 10.6 |
Liability, Defined Benefit Plan, Current | 3.0 |  | 3.5 |
Liability, Defined Benefit Plan, Noncurrent | 24.5 |  | 24.6 |
Liability, Defined Benefit Plan | 27.5 |  | 28.1 |
Other Postretirement Benefit Plans [Member] |  |  |  |
Change in Benefit Obligations [Roll Forward] |  |  |  |
Benefit Obligation at Previous December 31 | 33.0 |  | 34.3 |
Interest Cost | 0.8 |  | 1.3 | 1.1
Actuarial (Gains) Losses | 1.8 |  | 0.2 |
Benefit Payments | (2.4) |  | (2.8) |
Settlement Payments | 0.0 |  | 0.0 |
Benefit Obligation at December 31 | 33.2 |  | 33.0 | 34.3
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 | 2.4 |  | 2.8 |
Benefit Payments | (2.4) |  | (2.8) |
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 | (33.2) |  | (33.0) |
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 | 3.1 |  | 3.6 |
Liability, Defined Benefit Plan, Noncurrent | 30.1 |  | 29.4 |
Liability, Defined Benefit Plan | 33.2 |  | 33.0 |
Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 27.5 |  | 28.1 |
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | $ 17.1 |  | $ 17.5 |
[1] | (A) 2020 adjustment represents the overfunded position of the Company's salaried bargaining plans refunded during the year.

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