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Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plans | U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 2,440.1 $ 3,139.3 $ 3,847.8
Pension Plans | U.S. Plans | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,945.9 2,688.7  
Pension Plans | U.S. Plans | Fair Value | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 544.6 654.3  
Pension Plans | U.S. Plans | Fair Value | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 383.2 398.9  
Pension Plans | U.S. Plans | Fair Value | U.S. Govt. Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 291.7 413.2  
Pension Plans | U.S. Plans | Fair Value | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 293.8 479.3  
Pension Plans | U.S. Plans | Fair Value | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 185.5 525.2  
Pension Plans | U.S. Plans | Fair Value | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 87.1 154.1  
Pension Plans | U.S. Plans | Fair Value | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 95.0 (53.7)  
Pension Plans | U.S. Plans | Fair Value | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 92.1 108.4  
Pension Plans | U.S. Plans | Fair Value | Cumulative futures contracts variation margin paid to (received from) brokers      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 5.3 (5.8)  
Pension Plans | U.S. Plans | Fair Value | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.8 0.2  
Pension Plans | U.S. Plans | Fair Value | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 9.3 15.7  
Pension Plans | U.S. Plans | Fair Value | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (42.5) (1.1)  
Pension Plans | U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 890.2 1,234.5  
Pension Plans | U.S. Plans | Level 1 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 543.2 652.4  
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 291.7 413.2  
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 87.1 154.1  
Pension Plans | U.S. Plans | Level 1 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (4.7) 5.8  
Pension Plans | U.S. Plans | Level 1 | Cumulative futures contracts variation margin paid to (received from) brokers      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 5.3 (5.8)  
Pension Plans | U.S. Plans | Level 1 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.8 0.2  
Pension Plans | U.S. Plans | Level 1 | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 9.3 15.7  
Pension Plans | U.S. Plans | Level 1 | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (42.5) (1.1)  
Pension Plans | U.S. Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,055.7 1,454.2  
Pension Plans | U.S. Plans | Level 2 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1.4 1.9  
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 383.2 398.9  
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 293.8 479.3  
Pension Plans | U.S. Plans | Level 2 | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 185.5 525.2  
Pension Plans | U.S. Plans | Level 2 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 99.7 (59.5)  
Pension Plans | U.S. Plans | Level 2 | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 92.1 108.4  
Pension Plans | U.S. Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.0 0.0  
Pension Plans | U.S. Plans | Level 3 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.0 0.0  
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 494.2 450.6  
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   0.0  
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 65.0 78.6  
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Other, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 147.4 112.5  
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Private Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 238.9 234.2  
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 42.9 25.3  
Pension Plans | International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,444.3 2,431.6 3,129.4
Pension Plans | International Plans | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 411.1 949.8  
Pension Plans | International Plans | Fair Value | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.0 0.0  
Pension Plans | International Plans | Fair Value | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   34.1  
Pension Plans | International Plans | Fair Value | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2.8 3.0  
Pension Plans | International Plans | Fair Value | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 100.3 110.2  
Pension Plans | International Plans | Fair Value | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 126.5 383.8  
Pension Plans | International Plans | Fair Value | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets    
Pension Plans | International Plans | Fair Value | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets    
Pension Plans | International Plans | Fair Value | Other, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 15.0 390.0  
Pension Plans | International Plans | Fair Value | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 25.3    
Pension Plans | International Plans | Fair Value | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 20.5 28.7  
Pension Plans | International Plans | Fair Value | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 120.9    
Pension Plans | International Plans | Fair Value | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (0.2)    
Pension Plans | International Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 141.2 28.7  
Pension Plans | International Plans | Level 1 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.0 0.0  
Pension Plans | International Plans | Level 1 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 20.5 28.7  
Pension Plans | International Plans | Level 1 | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 120.9    
Pension Plans | International Plans | Level 1 | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (0.2)    
Pension Plans | International Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 169.6 810.9  
Pension Plans | International Plans | Level 2 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.0 0.0  
Pension Plans | International Plans | Level 2 | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   34.1  
Pension Plans | International Plans | Level 2 | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2.8 3.0  
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 126.5 383.8  
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets    
Pension Plans | International Plans | Level 2 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets  
Pension Plans | International Plans | Level 2 | Other, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 15.0 390.0  
Pension Plans | International Plans | Level 2 | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 25.3  
Pension Plans | International Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 100.3 110.2  
Pension Plans | International Plans | Level 3 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.0 0.0  
Pension Plans | International Plans | Level 3 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 100.3 110.2 127.5
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,033.2 1,481.8  
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 0.0 404.5  
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 788.8 1,077.3  
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Other, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 244.4  
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Private Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets    
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets    
Other Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 5.2 5.6 6.0
Other Postretirement Plans | U.S. Plans | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 5.2 5.6  
Other Postretirement Plans | U.S. Plans | Level 3 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 5.2 $ 5.6 $ 6.0