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Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | $ 562.5 |
Fair Value of Plan Assets (Period End) | 582.9 | $ 562.5
Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 19.3 |
Fair Value of Plan Assets (Period End) | 14.1 | 19.3
Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 25.9 |
Fair Value of Plan Assets (Period End) | 24.0 | 25.9
Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 22.7 |
Fair Value of Plan Assets (Period End) | 29.0 | 22.7
Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 3.6 |
Fair Value of Plan Assets (Period End) | 2.0 | 3.6
Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 28.9 |
Fair Value of Plan Assets (Period End) | 30.7 | 28.9
Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 100.4 |
Fair Value of Plan Assets (Period End) | 99.8 | 100.4
Investments measured at net asset value |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 462.1 |
Fair Value of Plan Assets (Period End) | 483.1 | 462.1
Level 1 | Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 19.3 |
Fair Value of Plan Assets (Period End) | 14.1 | 19.3
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) | 22.7 |
Fair Value of Plan Assets (Period End) | 29.0 | 22.7
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) | 28.9 |
Fair Value of Plan Assets (Period End) | 30.7 | 28.9
Level 1 | Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Fair Value of Plan Assets (Period Start) | 70.9 |
Fair Value of Plan Assets (Period End) | 73.8 | 70.9
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) | 3.6 |
Fair Value of Plan Assets (Period End) | 2.0 | 3.6
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) | 3.6 |
Fair Value of Plan Assets (Period End) | 2.0 | 3.6
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) | 25.9 | 25.6
Actual return on plan assets | (1.9) | 0.3
Fair Value of Plan Assets (Period End) | 24.0 | 25.9
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) | 25.9 |
Fair Value of Plan Assets (Period End) | $ 24.0 | $ 25.9

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