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Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | $ 508.6 | $ 453.7
Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 18.0 | 13.0
Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 25.6 | 25.6
Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 19.6 | 23.1
Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 5.5 | 5.8
Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 27.8 | 20.0
Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 96.5 | 87.5
Investments measured at net asset value |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 412.1 | 366.2
Level 1 | Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 18.0 | 13.0
Level 1 | Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 1 | Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 19.6 | 23.1
Level 1 | Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 1 | Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 27.8 | 20.0
Level 1 | Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 65.4 | 56.1
Level 2 | Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 2 | Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 2 | Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 2 | Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 5.5 | 5.8
Level 2 | Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 2 | Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 5.5 | 5.8
Level 3 | Investment funds |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 3 | Limited partnerships |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 25.6 | 25.6
Balance at beginning of period | 25.6 | 29.5
Actual return on plan assets | 0.0 | (3.9)
Balance at end of period | 25.6 | 25.6
Level 3 | Fixed income securities |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 3 | Insurance contracts |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 3 | Other plan assets |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0
Level 3 | Total plan assets subject to leveling |  |
Fair value assets and liabilities measured on recurring basis |  |
Defined Benefit Plan, Plan Assets, Amount | $ 25.6 | $ 25.6

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