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Benefit Plans (Details) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Aug. 11, 2023
May 31, 2022
Sep. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Aug. 11, 2023
Sep. 30, 2022
Components of net periodic benefit cost              
Contributions to qualified and non qualified pension plans     $ 1.6     $ 23.3 $ 27.6
Benefit Plan, Plan Assets, Reimbursement from CTA   $ 17.0          
Pension Plan [Member]              
Components of net periodic benefit cost              
Benefit Plan, Plan Assets, Reimbursement from CTA       $ 22.8      
U.S. defined benefit pension plans | Pension Plan [Member]              
Components of net periodic benefit cost              
Interest cost $ (2.2)   (2.7)   $ (4.5) (11.9) (13.0)
Expected return on plan assets (2.0)   (2.1)   (4.3) (11.0) (15.9)
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit 0.0   0.0   0.2 0.4 3.3
Net periodic pension benefit cost 0.2   0.6   14.7 1.3 14.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0.0   0.0   14.3 0.0 14.3
U.S. defined benefit pension plans | Other Postretirement Benefits Plan [Member]              
Components of net periodic benefit cost              
Interest cost     0.0   (0.1)   (0.2)
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit     0.0   0.1   0.3
Net periodic pension benefit cost 0.0   0.0   0.0 (0.1) (0.1)
Foreign Plan [Member] | Pension Plan [Member]              
Components of net periodic benefit cost              
Service cost 0.8   1.0   2.4 3.9 7.1
Interest cost (1.5)   (1.6)   (1.1) (7.2) (3.3)
Expected return on plan assets (1.7)   (2.0)   (3.8) (8.4) (11.6)
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit 0.5   0.0   0.4 2.3 1.3
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (0.1)   0.0   (0.1) (0.5) (0.3)
Net periodic pension benefit cost (2.1)   0.6   (0.8) (2.2) (2.8)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ (2.1)   $ 0.0   $ 0.0 $ (2.1) $ 0.0