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Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of Net Periodic Benefit Cost      
Pension termination $ 0.0 $ 76.9 $ 0.0
Income taxes related to other comprehensive income (loss) 0.0 (18.3) 0.0
Pension Benefits      
Components of Net Periodic Benefit Cost      
Service cost 0.0 1.4 1.2
Interest cost 0.0 0.7 5.1
Expected return on plan assets 0.0 (2.6) (5.0)
Amortization of net loss 0.0 1.7 2.5
Amortization of prior service cost 0.0 0.1 0.0
Pension termination 0.0 76.7 0.0
Net periodic benefit cost 0.0 78.0 3.8
Net gain (loss) 0.0 14.4 (28.0)
Amortization of net loss 0.0 1.7 2.6
Amortization of prior service cost 0.0 0.1 0.0
Pension termination 0.0 76.7 0.0
Income taxes related to other comprehensive income (loss) 0.0 (18.3) 0.0
Total recognized in Other comprehensive income (loss) 0.0 74.6 (25.4)
Total recognized in net periodic benefit cost and Other comprehensive income (loss) 0.0 (3.4) (29.2)
Other Post-retirement Benefits      
Components of Net Periodic Benefit Cost      
Service cost 0.1 0.1 0.1
Interest cost 0.4 0.4 0.3
Expected return on plan assets 0.0 0.0 0.0
Amortization of net loss 0.0 0.1 0.0
Amortization of prior service cost 0.0 0.0 0.0
Pension termination 0.0 0.1 0.0
Net periodic benefit cost 0.5 0.7 0.4
Net gain (loss) 0.1 2.2 0.6
Amortization of net loss 0.0 0.1 0.1
Amortization of prior service cost 0.0 0.0 0.0
Pension termination 0.0 0.1 0.0
Income taxes related to other comprehensive income (loss) 0.0 (0.1) 0.0
Total recognized in Other comprehensive income (loss) 0.1 2.3 0.7
Total recognized in net periodic benefit cost and Other comprehensive income (loss) (0.4) 1.6 0.3
Non-qualified benefit plans      
Components of Net Periodic Benefit Cost      
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.1 0.0
Expected return on plan assets 0.0 0.0 0.0
Amortization of net loss 0.0 0.1 0.1
Amortization of prior service cost 0.0 0.0 0.0
Pension termination 0.0 0.1 0.0
Net periodic benefit cost 0.1 0.3 0.1
Net gain (loss) 0.0 0.4 0.0
Amortization of net loss 0.0 0.1 0.1
Amortization of prior service cost 0.0 0.0 0.0
Pension termination 0.0 0.1 0.0
Income taxes related to other comprehensive income (loss) 0.0 0.1 0.0
Total recognized in Other comprehensive income (loss) 0.0 0.7 0.1
Total recognized in net periodic benefit cost and Other comprehensive income (loss) $ (0.1) $ 0.4 $ 0.0