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Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | $ 582.9 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 | (22.3) | $ 0.0
Fair Value of Plan Assets (Period End) | 367.6 | 582.9
Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 14.1 |
Fair Value of Plan Assets (Period End) | 10.6 | 14.1
Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 24.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 24.0
Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 29.0 |
Fair Value of Plan Assets (Period End) | 12.5 | 29.0
Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 2.0 |
Fair Value of Plan Assets (Period End) | 1.6 | 2.0
Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 30.7 |
Fair Value of Plan Assets (Period End) | 11.9 | 30.7
Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 99.8 |
Fair Value of Plan Assets (Period End) | 36.6 | 99.8
Investments measured at net asset value |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 483.1 |
Fair Value of Plan Assets (Period End) | 331.0 | 483.1
Level 1 | Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 14.1 |
Fair Value of Plan Assets (Period End) | 10.6 | 14.1
Level 1 | Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 1 | Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 29.0 |
Fair Value of Plan Assets (Period End) | 12.5 | 29.0
Level 1 | Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 1 | Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 30.7 |
Fair Value of Plan Assets (Period End) | 11.9 | 30.7
Level 1 | Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 73.8 |
Fair Value of Plan Assets (Period End) | 35.0 | 73.8
Level 2 | Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 2 | Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 2 | Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 2 | Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 2.0 |
Fair Value of Plan Assets (Period End) | 1.6 | 2.0
Level 2 | Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 2 | Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 2.0 |
Fair Value of Plan Assets (Period End) | 1.6 | 2.0
Level 3 | Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 3 | Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 24.0 | 25.9
Actual return on plan assets | (1.7) | (1.9)
Fair Value of Plan Assets (Period End) | 0.0 | 24.0
Level 3 | Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 3 | Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 3 | Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 0.0 |
Fair Value of Plan Assets (Period End) | 0.0 | 0.0
Level 3 | Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 24.0 |
Fair Value of Plan Assets (Period End) | $ 0.0 | $ 24.0

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