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Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 1.4 | $ 0.4 |
Settlement cost | 13.6 | 6.0 | $ 2.2
Net current period other comprehensive income (loss) | 12.9 | 7.3 | (4.2)
Accumulated other comprehensive loss, net of tax | (24.8) | (32.1) |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (2.1) | 0.9 |
Accumulated other comprehensive loss, net of tax | (11.9) | (24.8) | (32.1)
Net current period other comprehensive income (loss) | 12.9 | 7.3 | (4.2)
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net current period other comprehensive income (loss) | (0.2) | (1.4) |
Defined Benefit Plans Income Loss [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | (24.9) | (33.9) |
Other comprehensive income (loss) before reclassifications | (7.6) | 1.4 |
Amounts reclassified from accumulated other comprehensive income (loss) | 1.4 | 1.6 |
Net current period other comprehensive income (loss) | 7.4 | 9.0 |
Accumulated other comprehensive income (loss) | (17.5) | (24.9) | (33.9)
Defined Benefit Plans Income Loss [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | 1.1 | 1.7 |
Other comprehensive income (loss) before reclassifications | 5.5 | (0.7) |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.1 |
Net current period other comprehensive income (loss) | 5.5 | (0.6) |
Accumulated other comprehensive income (loss) | 6.6 | 1.1 | 1.7
Defined Benefit Plan Prior Service Cost [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | (1.2) | (0.2) |
Other comprehensive income (loss) before reclassifications | (0.0) | (1.1) |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.2 | 0.1 |
Net current period other comprehensive income (loss) | 0.2 | (1.0) |
Accumulated other comprehensive income (loss) | (1.0) | (1.2) | (0.2)
Defined Benefit Plan Prior Service Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated other comprehensive income (loss) | 0.2 | 1.6 |
Other comprehensive income (loss) before reclassifications | 0.0 | 0.0 |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.2) | (1.4) |
Accumulated other comprehensive income (loss) | 0.0 | 0.2 | 1.6
Commodity Contract [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
AOCI, Derivative Qualifying as Hedge, Excluded Component, after Tax | 0.0 | (1.3) |
AOCI, Derivative Qualifying as Hedge, Excluded Component, after Tax | 0.0 | 0.0 | $ (1.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0.0 | 1.3 |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0 |
Net current period other comprehensive income (loss) | 0.0 | 1.3 |
Settlement Cost [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Settlement cost | 13.6 | 6.0 |
Settlement Cost [Member] | Defined Benefit Plans Income Loss [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Settlement cost | 13.6 | 6.0 |
Settlement Cost [Member] | Defined Benefit Plan Prior Service Cost [Member] | Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Settlement cost | 0.0 | 0.0 |
Settlement Cost [Member] | Defined Benefit Plan Prior Service Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Settlement cost | 0.0 | 0.0 |
Settlement Cost [Member] | Commodity Contract [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Settlement cost | $ 0.0 | $ 0.0 |

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