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Pension and Other Post-retirement Benefits Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 11, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 603.1 | $ 598.9 | $ 576.8
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 603.1 | 598.9 | $ 576.8
Pension Benefits | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 603.1 | 598.9 |
Pension Benefits | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 79.8 | 84.1 |
Pension Benefits | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 523.3 | $ 514.8 |
Pension Benefits | Equities: | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 53.00% | 53.00% |
Pension Benefits | Equities: | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 69.00% | 69.00% |
Pension Benefits | U.S. large cap | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 22.00% | 22.00% |
Pension Benefits | U.S. large cap | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 28.00% | 28.00% |
Pension Benefits | U.S. large cap | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 151.9 | $ 148.9 |
Pension Benefits | U.S. large cap | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 0.0 |
Pension Benefits | U.S. large cap | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 151.9 | $ 148.9 |
Pension Benefits | U.S. small cap | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 4.00% | 4.00% |
Pension Benefits | U.S. small cap | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 10.00% | 10.00% |
Pension Benefits | U.S. small cap | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 48.1 | $ 41.1 |
Pension Benefits | U.S. small cap | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 0.0 |
Pension Benefits | U.S. small cap | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 48.1 | $ 41.1 |
Pension Benefits | International all cap | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 21.00% | 21.00% |
Pension Benefits | International all cap | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 29.00% | 29.00% |
Pension Benefits | International all cap | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 158.5 | $ 152.4 |
Pension Benefits | International all cap | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 0.0 |
Pension Benefits | International all cap | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 158.5 | $ 152.4 |
Pension Benefits | International small cap | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 2.00% | 2.00% |
Pension Benefits | International small cap | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 8.00% | 8.00% |
Pension Benefits | International small cap | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 37.0 | $ 34.7 |
Pension Benefits | International small cap | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 0.0 |
Pension Benefits | International small cap | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 37.0 | $ 34.7 |
Pension Benefits | Real estate equities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 0.00% | 0.00% |
Pension Benefits | Real estate equities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 13.00% | 13.00% |
Pension Benefits | Real estate equities | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 53.5 | $ 54.9 |
Pension Benefits | Real estate equities | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 0.0 |
Pension Benefits | Real estate equities | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 53.5 | $ 54.9 |
Pension Benefits | Fixed income: | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 25.00% | 25.00% |
Pension Benefits | Fixed income: | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 35.00% | 35.00% |
Pension Benefits | Cash and equivalents | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 0.00% | 0.00% |
Pension Benefits | Cash and equivalents | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 10.00% | 10.00% |
Pension Benefits | Cash and equivalents | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 4.0 | $ 6.5 |
Pension Benefits | Cash and equivalents | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 4.0 | 6.5 |
Pension Benefits | Cash and equivalents | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 0.0 | $ 0.0 |
Pension Benefits | Aggregate | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 9.00% | 9.00% |
Pension Benefits | Aggregate | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 19.00% | 19.00% |
Pension Benefits | Aggregate | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 74.3 | $ 76.7 |
Pension Benefits | Aggregate | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 0.0 |
Pension Benefits | Aggregate | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 74.3 | $ 76.7 |
Pension Benefits | Core plus | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 9.00% | 9.00% |
Pension Benefits | Core plus | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target range | 19.00% | 19.00% |
Pension Benefits | Core plus | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 75.8 | $ 77.6 |
Pension Benefits | Core plus | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 75.8 | 77.6 |
Pension Benefits | Core plus | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets |  | 0.0 |
Pension Benefits | Group annuity contracts | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 6.1 |
Pension Benefits | Group annuity contracts | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | 0.0 | 0.0 |
Pension Benefits | Group annuity contracts | Significant observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Assets | $ 0.0 | $ 6.1 |

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