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Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension Plans | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 3,334.2 | $ 3,112.8 | $ 3,578.4
Pension Plans | U.S. Plans | Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2,931.5 | 2,822.9 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 955.3 | 911.7 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 578.8 | 494.8 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | U.S. Govt. Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 436.0 | 498.5 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 278.1 | 374.6 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 433.6 | 196.6 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 14.0 | 17.0 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Real Estate, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 186.5 | 156.7 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (103.5) | 35.8 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 135.5 | 143.7 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Cumulative futures contracts variation margin paid to (received from) brokers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 8.2 | (29.3) |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2.0 | 3.7 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 14.4 | 20.5 |
Pension Plans | U.S. Plans | Level 1, 2 and 3 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (7.4) | (1.4) |
Pension Plans | U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,411.8 | 1,451.6 |
Pension Plans | U.S. Plans | Level 1 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 952.8 | 909.0 |
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 436.0 | 498.5 |
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 14.0 | 17.0 |
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 | (8.2) | 33.6 |
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 | 8.2 | (29.3) |
Pension Plans | U.S. Plans | Level 1 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2.0 | 3.7 |
Pension Plans | U.S. Plans | Level 1 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 14.4 | 20.5 |
Pension Plans | U.S. Plans | Level 1 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (7.4) | (1.4) |
Pension Plans | U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,519.7 | 1,371.3 |
Pension Plans | U.S. Plans | Level 2 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2.5 | 2.7 |
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 578.8 | 494.8 |
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 278.1 | 374.6 |
Pension Plans | U.S. Plans | Level 2 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 433.6 | 196.6 |
Pension Plans | U.S. Plans | Level 2 | Real Estate, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 186.5 | 156.7 |
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 | (95.3) | 2.2 |
Pension Plans | U.S. Plans | Level 2 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 135.5 | 143.7 |
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 |  |
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 402.7 | 289.9 |
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 | 86.3 | 0.0 |
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 | 127.0 | 110.2 |
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 | 189.0 | 179.1 |
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 | 0.4 | 0.6 |
Pension Plans | International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2,816.4 | 2,539.4 | 2,833.9
Pension Plans | International Plans | Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,412.3 | 1,229.8 |
Pension Plans | International Plans | Level 1, 2 and 3 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.0 | 0.0 |
Pension Plans | International Plans | Level 1, 2 and 3 | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 176.7 | 165.6 |
Pension Plans | International Plans | Level 1, 2 and 3 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 91.0 | 145.5 |
Pension Plans | International Plans | Level 1, 2 and 3 | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 123.1 | 123.7 |
Pension Plans | International Plans | Level 1, 2 and 3 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 441.0 | 321.4 |
Pension Plans | International Plans | Level 1, 2 and 3 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1.0 | 1.3 |
Pension Plans | International Plans | Level 1, 2 and 3 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 6.5 | 2.4 |
Pension Plans | International Plans | Level 1, 2 and 3 | Other, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 372.8 | 317.0 |
Pension Plans | International Plans | Level 1, 2 and 3 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 189.2 | 123.6 |
Pension Plans | International Plans | Level 1, 2 and 3 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 18.1 | 29.6 |
Pension Plans | International Plans | Level 1, 2 and 3 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.2 | 2.0 |
Pension Plans | International Plans | Level 1, 2 and 3 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (7.3) | (2.3) |
Pension Plans | International Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 11.0 | 29.5 |
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 |  | 0.2 |
Pension Plans | International Plans | Level 1 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 18.1 | 29.6 |
Pension Plans | International Plans | Level 1 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.2 | 2.0 |
Pension Plans | International Plans | Level 1 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (7.3) | (2.3) |
Pension Plans | International Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,278.2 | 1,076.6 |
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 | 176.7 | 165.6 |
Pension Plans | International Plans | Level 2 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 91.0 | 145.3 |
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 441.0 | 321.4 |
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1.0 | 1.3 |
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 | 6.5 | 2.4 |
Pension Plans | International Plans | Level 2 | Other, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 372.8 | 317.0 |
Pension Plans | International Plans | Level 2 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 189.2 | 123.6 |
Pension Plans | International Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 123.1 | 123.7 |
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 | 123.1 | 123.7 | 135.8
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,404.1 | 1,309.6 |
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 | 406.9 | 454.9 |
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 | 941.0 | 814.0 |
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 | 24.8 | 23.9 |
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 | 31.4 | 16.8 |
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 | 6.9 | 7.8 | 7.6
Other Postretirement Plans | U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 6.9 | 7.8 |
Other Postretirement Plans | U.S. Plans | Level 3 | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 6.9 | $ 7.8 | $ 7.6

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