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Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plans | U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 3,847.8 $ 3,334.2 $ 3,112.8
Pension Plans | U.S. Plans | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 3,403.4 2,931.5  
Pension Plans | U.S. Plans | Fair Value | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 774.1 955.3  
Pension Plans | U.S. Plans | Fair Value | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 640.6 578.8  
Pension Plans | U.S. Plans | Fair Value | U.S. Govt. Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 388.5 436.0  
Pension Plans | U.S. Plans | Fair Value | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 589.9 278.1  
Pension Plans | U.S. Plans | Fair Value | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 689.9 433.6  
Pension Plans | U.S. Plans | Fair Value | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 112.1 14.0  
Pension Plans | U.S. Plans | Fair Value | Real Estate, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   186.5  
Pension Plans | U.S. Plans | Fair Value | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (67.3) (103.5)  
Pension Plans | U.S. Plans | Fair Value | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 233.4 135.5  
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 (1.1) 8.2  
Pension Plans | U.S. Plans | Fair Value | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 21.8 2.0  
Pension Plans | U.S. Plans | Fair Value | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 28.8 14.4  
Pension Plans | U.S. Plans | Fair Value | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (7.3) (7.4)  
Pension Plans | U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,319.0 1,411.8  
Pension Plans | U.S. Plans | Level 1 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 771.2 952.8  
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 388.5 436.0  
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 112.1 14.0  
Pension Plans | U.S. Plans | Level 1 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 5.0 (8.2)  
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 (1.1) 8.2  
Pension Plans | U.S. Plans | Level 1 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 21.8 2.0  
Pension Plans | U.S. Plans | Level 1 | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 28.8 14.4  
Pension Plans | U.S. Plans | Level 1 | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (7.3) (7.4)  
Pension Plans | U.S. Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2,084.4 1,519.7  
Pension Plans | U.S. Plans | Level 2 | Common Stocks      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2.9 2.5  
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 640.6 578.8  
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 589.9 278.1  
Pension Plans | U.S. Plans | Level 2 | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 689.9 433.6  
Pension Plans | U.S. Plans | Level 2 | Real Estate, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   186.5  
Pension Plans | U.S. Plans | Level 2 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (72.3) (95.3)  
Pension Plans | U.S. Plans | Level 2 | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 233.4 135.5  
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 444.4 402.7  
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 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 121.7 86.3  
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 104.2 127.0  
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 208.0 189.0  
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 10.5 0.4  
Pension Plans | International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 3,129.4 2,816.4 2,539.4
Pension Plans | International Plans | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,552.9 1,412.3  
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 153.4 176.7  
Pension Plans | International Plans | Fair Value | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 125.8 91.0  
Pension Plans | International Plans | Fair Value | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 127.5 123.1  
Pension Plans | International Plans | Fair Value | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 471.2 441.0  
Pension Plans | International Plans | Fair Value | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2.0 1.0  
Pension Plans | International Plans | Fair Value | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 20.5 6.5  
Pension Plans | International Plans | Fair Value | Other, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 381.4 372.8  
Pension Plans | International Plans | Fair Value | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 178.0 189.2  
Pension Plans | International Plans | Fair Value | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 111.7 18.1  
Pension Plans | International Plans | Fair Value | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2.1 0.2  
Pension Plans | International Plans | Fair Value | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (20.7) (7.3)  
Pension Plans | International Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 93.1 11.0  
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 | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   0.0  
Pension Plans | International Plans | Level 1 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 111.7 18.1  
Pension Plans | International Plans | Level 1 | Receivables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2.1 0.2  
Pension Plans | International Plans | Level 1 | Payables      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets (20.7) (7.3)  
Pension Plans | International Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,332.3 1,278.2  
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 153.4 176.7  
Pension Plans | International Plans | Level 2 | Other Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 125.8 91.0  
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 471.2 441.0  
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 2.0 1.0  
Pension Plans | International Plans | Level 2 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 20.5 6.5  
Pension Plans | International Plans | Level 2 | Other, Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 381.4 372.8  
Pension Plans | International Plans | Level 2 | Pooled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 178.0 189.2  
Pension Plans | International Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 127.5 123.1  
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 127.5 123.1 123.7
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 1,576.5 1,404.1  
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 429.9 406.9  
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 1,067.4 941.0  
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 27.4 24.8  
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 51.8 31.4  
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 0.0 0.0  
Other Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 6.0 6.9 7.8
Other Postretirement Plans | U.S. Plans | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 6.0 6.9  
Other Postretirement Plans | U.S. Plans | Level 3 | Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 6.0 $ 6.9 $ 7.8