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Employee Benefit Plans - Fair Values of Pension Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Employee benefit plans
Fair value of plan assets	$ 255.8	$ 295.5
Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	179.2	180.3
U.S. Government securities
Employee benefit plans
Fair value of plan assets	13.1	34.4
Global equity common trust funds
Employee benefit plans
Fair value of plan assets	35.2	36.4
Commingled global fund allocation
Employee benefit plans
Fair value of plan assets	16.8	26.1
Short-term investments
Employee benefit plans
Fair value of plan assets	10.6	17.4
Other
Employee benefit plans
Fair value of plan assets	0.9	0.9
Quoted Prices in Active Markets for Identical Assets (Level 1)
Employee benefit plans
Fair value of plan assets	4.3	14.7
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Global equity common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commingled global fund allocation
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments
Employee benefit plans
Fair value of plan assets	4.3	14.7
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Observable Inputs (Level 2)
Employee benefit plans
Fair value of plan assets	250.6	279.9
Significant Observable Inputs (Level 2) | Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	179.2	180.3
Significant Observable Inputs (Level 2) | U.S. Government securities
Employee benefit plans
Fair value of plan assets	13.1	34.4
Significant Observable Inputs (Level 2) | Global equity common trust funds
Employee benefit plans
Fair value of plan assets	35.2	36.4
Significant Observable Inputs (Level 2) | Commingled global fund allocation
Employee benefit plans
Fair value of plan assets	16.8	26.1
Significant Observable Inputs (Level 2) | Short-term investments
Employee benefit plans
Fair value of plan assets	6.3	2.7
Significant Observable Inputs (Level 2) | Other
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3)
Employee benefit plans
Fair value of plan assets	0.9	0.9
Significant Unobservable Inputs (Level 3) | Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | U.S. Government securities
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Global equity common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Commingled global fund allocation
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Short-term investments
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Other
Employee benefit plans
Fair value of plan assets	$ 0.9	$ 0.9

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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