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Employee Benefit Plans - Fair Value Measurements (Details) - Quoted Prices in Active Markets for Identical Assets (Level 1) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plans |  |
Fair value of plan assets | $ 162.4 | $ 156.5
Cash |  |
Defined Benefit Plans |  |
Fair value of plan assets | 0.6 | 0.6
U.S. treasury bonds |  |
Defined Benefit Plans |  |
Fair value of plan assets | $ 21.0 | 20.9
Equity mutual funds |  |
Defined Benefit Plans |  |
Target allocation percentage of investments | 12.00% |
Fair value of plan assets | $ 19.0 | 17.8
Fixed income mutual funds |  |
Defined Benefit Plans |  |
Target allocation percentage of investments | 88.00% |
Fair value of plan assets | $ 121.8 | $ 117.2

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