Employee Benefit Plans - Fair Value Measurements (Details) - Quoted Prices in Active Markets for Identical Assets (Level 1) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plans
Fair value of plan assets	$ 114.8	$ 114.9
Cash
Defined Benefit Plans
Fair value of plan assets	0.5	0.6
U.S. treasury bonds
Defined Benefit Plans
Fair value of plan assets	$ 21.8	30.1
Equity mutual funds
Defined Benefit Plans
Target allocation percentage of investments	12.00%
Fair value of plan assets	$ 13.1	13.2
Fixed income mutual funds
Defined Benefit Plans
Target allocation percentage of investments	88.00%
Fair value of plan assets	$ 79.4	$ 71.0