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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures, Activity in Level 3 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Pension [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | $ 745.7 | $ 759.4
Fair Value, End of Year | 568.6 | 745.7
Pension [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 21.6 |
Fair Value, End of Year | 22.4 | 21.6
Pension [Member] | Private Equity [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 0.0 | 7.0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held |  | (3.5)
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement |  | (3.5)
Fair Value, End of Year |  | 0.0
Pension [Member] | Real Estate [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 21.6 |
Fair Value, End of Year | 22.4 | 21.6
Pension [Member] | Real Estate [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 21.6 | 18.0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 1.0 | 3.6
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | (0.2) | 0.0
Fair Value, End of Year | 22.4 | 21.6
Postretirement Health and Life [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 201.8 | 186.0
Fair Value, End of Year | 162.6 | 201.8
Postretirement Health and Life [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 2.0 |
Fair Value, End of Year | 0.0 | 2.0
Postretirement Health and Life [Member] | Private Equity [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 2.0 |
Fair Value, End of Year |  | 2.0
Postretirement Health and Life [Member] | Private Equity [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 2.0 | 1.7
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | (1.5) | 0.8
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | (0.5) | (0.5)
Fair Value, End of Year | $ 0.0 | $ 2.0

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