Pension and Other Post-retirement Benefits - Fair Value Measurement of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	$ 18.5	$ 20.2
Non-investment plan assets	0.1	0.1
Total plan assets	18.6	20.3
Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.2	0.2
Common stocks
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	2.3	2.5
U.S. Treasury securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	6.5	6.7
Other fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	7.4	7.4
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	1.2	1.0
Private equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.9	2.4
Quoted Prices in Active Markets for Identical Contracts (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	3.3	3.3
Quoted Prices in Active Markets for Identical Contracts (Level 1) \| Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.2	0.2
Quoted Prices in Active Markets for Identical Contracts (Level 1) \| Common stocks
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	2.3	2.5
Quoted Prices in Active Markets for Identical Contracts (Level 1) \| U.S. Treasury securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.8	0.6
Quoted Prices in Active Markets for Identical Contracts (Level 1) \| Other fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Quoted Prices in Active Markets for Identical Contracts (Level 1) \| Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Quoted Prices in Active Markets for Identical Contracts (Level 1) \| Private equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	14.3	14.5
Significant Other Observable Inputs (Level 2) \| Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Other Observable Inputs (Level 2) \| Common stocks
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Other Observable Inputs (Level 2) \| U.S. Treasury securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	5.7	6.1
Significant Other Observable Inputs (Level 2) \| Other fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	7.4	7.4
Significant Other Observable Inputs (Level 2) \| Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	1.2	1.0
Significant Other Observable Inputs (Level 2) \| Private equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Non- observable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.9	2.4
Significant Non- observable Inputs (Level 3) \| Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Non- observable Inputs (Level 3) \| Common stocks
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Non- observable Inputs (Level 3) \| U.S. Treasury securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Non- observable Inputs (Level 3) \| Other fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Non- observable Inputs (Level 3) \| Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	0.0	0.0
Significant Non- observable Inputs (Level 3) \| Private equity
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan asset investments	$ 0.9	$ 2.4	$ 2.2