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Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Pension Plans | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 3,139.3 | $ 3,847.8 | $ 3,334.2
Pension Plans | U.S. Plans | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2,688.7 | 3,403.4 |
Pension Plans | U.S. Plans | Fair Value | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 654.3 | 774.1 |
Pension Plans | U.S. Plans | Fair Value | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 398.9 | 640.6 |
Pension Plans | U.S. Plans | Fair Value | U.S. Govt. Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 413.2 | 388.5 |
Pension Plans | U.S. Plans | Fair Value | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 479.3 | 589.9 |
Pension Plans | U.S. Plans | Fair Value | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 525.2 | 689.9 |
Pension Plans | U.S. Plans | Fair Value | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 154.1 | 112.1 |
Pension Plans | U.S. Plans | Fair Value | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (53.7) | (67.3) |
Pension Plans | U.S. Plans | Fair Value | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 108.4 | 233.4 |
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 | (5.8) | (1.1) |
Pension Plans | U.S. Plans | Fair Value | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.2 | 21.8 |
Pension Plans | U.S. Plans | Fair Value | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 15.7 | 28.8 |
Pension Plans | U.S. Plans | Fair Value | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (1.1) | (7.3) |
Pension Plans | U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,234.5 | 1,319.0 |
Pension Plans | U.S. Plans | Level 1 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 652.4 | 771.2 |
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 413.2 | 388.5 |
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 154.1 | 112.1 |
Pension Plans | U.S. Plans | Level 1 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 5.8 | 5.0 |
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 | (5.8) | (1.1) |
Pension Plans | U.S. Plans | Level 1 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.2 | 21.8 |
Pension Plans | U.S. Plans | Level 1 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 15.7 | 28.8 |
Pension Plans | U.S. Plans | Level 1 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (1.1) | (7.3) |
Pension Plans | U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,454.2 | 2,084.4 |
Pension Plans | U.S. Plans | Level 2 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1.9 | 2.9 |
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 398.9 | 640.6 |
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 479.3 | 589.9 |
Pension Plans | U.S. Plans | Level 2 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 525.2 | 689.9 |
Pension Plans | U.S. Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (59.5) | (72.3) |
Pension Plans | U.S. Plans | Level 2 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 108.4 | 233.4 |
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 | 450.6 | 444.4 |
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 | 78.6 | 121.7 |
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 | 112.5 | 104.2 |
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 | 234.2 | 208.0 |
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 | 25.3 | 10.5 |
Pension Plans | International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2,431.6 | 3,129.4 | 2,816.4
Pension Plans | International Plans | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 949.8 | 1,552.9 |
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 | 153.4 |
Pension Plans | International Plans | Fair Value | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 3.0 | 125.8 |
Pension Plans | International Plans | Fair Value | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 110.2 | 127.5 |
Pension Plans | International Plans | Fair Value | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 383.8 | 471.2 |
Pension Plans | International Plans | Fair Value | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 2.0 |
Pension Plans | International Plans | Fair Value | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 20.5 |
Pension Plans | International Plans | Fair Value | Other, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 390.0 | 381.4 |
Pension Plans | International Plans | Fair Value | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 178.0 |
Pension Plans | International Plans | Fair Value | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 28.7 | 111.7 |
Pension Plans | International Plans | Fair Value | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 2.1 |
Pension Plans | International Plans | Fair Value | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | (20.7) |
Pension Plans | International Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 28.7 | 93.1 |
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 | 28.7 | 111.7 |
Pension Plans | International Plans | Level 1 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 2.1 |
Pension Plans | International Plans | Level 1 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | (20.7) |
Pension Plans | International Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 810.9 | 1,332.3 |
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 | 153.4 |
Pension Plans | International Plans | Level 2 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 3.0 | 125.8 |
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 383.8 | 471.2 |
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 2.0 |
Pension Plans | International Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 20.5 |
Pension Plans | International Plans | Level 2 | Other, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 390.0 | 381.4 |
Pension Plans | International Plans | Level 2 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 178.0 |
Pension Plans | International Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 110.2 | 127.5 |
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 | 110.2 | 127.5 | 123.1
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,481.8 | 1,576.5 |
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 | 404.5 | 429.9 |
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 | 1,077.3 | 1,067.4 |
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 | 0.0 | 27.4 |
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 | 0.0 | 51.8 |
Other Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 5.6 | 6.0 | 6.9
Other Postretirement Plans | U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 5.6 | 6.0 |
Other Postretirement Plans | U.S. Plans | Level 3 | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 5.6 | $ 6.0 | $ 6.9

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