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Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Apr. 11, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Net benefit liabilities | $ 249.6 | $ 239.3
Net projected benefit obligations, current | $ 2.9 | 19.2
Expected return on plan assets | 6.48% |
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net benefit liabilities | $ 233.5 | $ 202.1
Net projected benefit obligations, current | 1.4 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 35.7 |
Other Postretirement Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 1.5 |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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