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Employee plans - Components of Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2024
Nov. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]       Other (expense), net    
Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Settlement losses       $ 130.6 $ 348.9  
Pension Plans | U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost       0.0 0.0 $ 0.0
Interest cost       115.9 152.7 114.6
Expected return on plan assets       (125.4) (178.6) (189.8)
Amortization of prior service credit       (2.5) (2.5) (2.5)
Recognized net actuarial loss       64.3 75.6 125.9
Settlement losses $ 130.1 $ 167.2 $ 181.0 130.1 348.2 0.0
Net periodic pension expense (income)       182.4 395.4 48.2
Pension Plans | International Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost       1.3 1.1 1.9
Interest cost       68.0 72.3 39.3
Expected return on plan assets       (88.1) (84.9) (77.4)
Amortization of prior service credit       (2.2) (2.4) (2.6)
Recognized net actuarial loss       20.9 9.1 37.7
Settlement losses       0.5 0.7 0.0
Net periodic pension expense (income)       0.4 (4.1) (1.1)
Other Postretirement Benefit Plans            
Defined Benefit Plan Disclosure [Line Items]            
Service cost       0.1 0.2 0.2
Interest cost       2.3 2.6 1.9
Expected return on plan assets       (0.2) (0.3) (0.3)
Amortization of prior service credit       0.2 (1.3) (1.4)
Recognized net actuarial loss       (3.0) (4.0) (2.2)
Net periodic pension expense (income)       $ (0.6) $ (2.8) $ (1.8)