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Pension and Other Post-retirement Benefits Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Apr. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Assets | $ 634.6 | $ 652.0 | $ 603.1 | $ 598.9
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Assets | 634.6 | $ 652.0 | 603.1 | $ 598.9
Pension Benefits | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Assets | 634.6 |  | 603.1 |
Pension Benefits | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Assets | 78.8 |  | 79.8 |
Pension Benefits | Significant observable inputs (Level 2) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Assets | $ 555.8 |  | $ 523.3 |
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 | $ 173.7 |  | $ 151.9 |
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 | $ 173.7 |  | $ 151.9 |
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 | $ 44.7 |  | $ 48.1 |
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 | $ 44.7 |  | $ 48.1 |
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 | $ 159.1 |  | $ 158.5 |
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 | $ 159.1 |  | $ 158.5 |
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 | $ 41.7 |  | $ 37.0 |
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 | $ 41.7 |  | $ 37.0 |
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 | $ 63.5 |  | $ 53.5 |
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 | $ 63.5 |  | $ 53.5 |
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 | $ 4.5 |  | $ 4.0 |
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 | 4.5 |  | 4.0 |
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 | $ 73.1 |  | $ 74.3 |
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 | $ 73.1 |  | $ 74.3 |
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 | $ 74.3 |  | $ 75.8 |
Pension Benefits | Core plus | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Assets | 74.3 |  | 75.8 |
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 |  | 0.0 |
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 |  | $ 0.0 |

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