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Employee plans - Components of Net Periodic Benefit Expense (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]          
Settlement loss   $ 142.1      
Pension Plans | U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost     $ 0.0 $ 0.0 $ 0.0
Interest cost     162.5 197.5 186.6
Expected return on plan assets     (208.6) (218.2) (230.6)
Amortization of prior service credit     (2.5) (2.5) (2.5)
Recognized net actuarial loss     135.5 116.6 125.1
Curtailment gain     0.0 0.0 0.0
Settlement loss $ 142.1   142.1 0.0 0.0
Net periodic pension/benefit cost (income)     229.0 93.4 78.6
Pension Plans | International Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost     2.8 2.8 3.2
Interest cost     53.4 68.3 67.3
Expected return on plan assets     (90.6) (104.6) (114.4)
Amortization of prior service credit     (2.5) (2.5) (3.7)
Recognized net actuarial loss     43.2 34.2 42.3
Curtailment gain     0.0 (0.1) 0.0
Settlement loss     0.0 1.2 6.4
Net periodic pension/benefit cost (income)     6.3 (0.7) 1.1
Other Postretirement Benefit Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost     0.5 0.5 0.6
Interest cost     4.4 4.8 4.8
Expected return on plan assets     (0.4) (0.4) (0.4)
Amortization of prior service credit     (1.6) (1.7) (1.6)
Recognized net actuarial loss     1.0 0.7 1.0
Net periodic pension/benefit cost (income)     $ 3.9 $ 3.9 $ 4.4