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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, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plans |  |
Fair value of plan assets | $ 156.5 | $ 148.6
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 | 20.9 | 27.0
Equity mutual funds |  |
Defined Benefit Plans |  |
Fair value of plan assets | $ 17.8 | 17.8
Target allocation percentage of investments | 12.00% |
Fixed income mutual funds |  |
Defined Benefit Plans |  |
Fair value of plan assets | $ 117.2 | $ 103.2
Target allocation percentage of investments | 88.00% |

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