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Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Pension Plans | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 3,112.8 | $ 3,578.4 | $ 3,452.1
Pension Plans | U.S. Plans | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 911.7 | 1,465.1 |
Pension Plans | U.S. Plans | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 494.8 | 584.4 |
Pension Plans | U.S. Plans | U.S. Govt. Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 498.5 | 139.8 |
Pension Plans | U.S. Plans | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 374.6 | 830.6 |
Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 196.6 |  |
Pension Plans | U.S. Plans | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 17.0 | 113.5 |
Pension Plans | U.S. Plans | Real Estate Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 156.7 |  |
Pension Plans | U.S. Plans | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 2.6 |
Pension Plans | U.S. Plans | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 35.8 |  |
Pension Plans | U.S. Plans | Cumulative futures contracts variation margin received from brokers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (29.3) |  |
Pension Plans | U.S. Plans | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 143.7 | 228.0 |
Pension Plans | U.S. Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 3.7 | 34.8 |
Pension Plans | U.S. Plans | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 20.5 | 58.1 |
Pension Plans | U.S. Plans | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (1.4) | (116.7) |
Pension Plans | U.S. Plans | Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2,822.9 | 3,340.2 |
Pension Plans | U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,451.6 | 1,704.5 |
Pension Plans | U.S. Plans | Level 1 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 909.0 | 1,461.9 |
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 498.5 | 139.8 |
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 17.0 | 113.5 |
Pension Plans | U.S. Plans | Level 1 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 13.1 |
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 | 33.6 |  |
Pension Plans | U.S. Plans | Level 1 | Cumulative futures contracts variation margin received from brokers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (29.3) |  |
Pension Plans | U.S. Plans | Level 1 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 3.7 | 34.8 |
Pension Plans | U.S. Plans | Level 1 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 20.5 | 58.1 |
Pension Plans | U.S. Plans | Level 1 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (1.4) | (116.7) |
Pension Plans | U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,371.3 | 1,635.7 |
Pension Plans | U.S. Plans | Level 2 | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2.7 | 3.2 |
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 494.8 | 584.4 |
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 374.6 | 830.6 |
Pension Plans | U.S. Plans | Level 2 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 196.6 |  |
Pension Plans | U.S. Plans | Level 2 | Real Estate Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 156.7 |  |
Pension Plans | U.S. Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | (10.5) |
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 | 2.2 |  |
Pension Plans | U.S. Plans | Level 2 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 143.7 | 228.0 |
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 | 289.9 | 238.2 |
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 | 0.0 | 19.8 |
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 | 110.2 | 105.1 |
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 | 179.1 | 112.4 |
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 | 0.6 | 0.9 |
Pension Plans | International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2,539.4 | 2,833.9 | 2,429.7
Pension Plans | International Plans | Common Stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.0 | 0.0 |
Pension Plans | International Plans | Equity Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 165.6 | 84.0 |
Pension Plans | International Plans | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 145.5 | 254.1 |
Pension Plans | International Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 123.7 | 135.8 |
Pension Plans | International Plans | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 321.4 | 267.5 |
Pension Plans | International Plans | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1.3 | 1.4 |
Pension Plans | International Plans | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 1.2 |
Pension Plans | International Plans | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2.4 |  |
Pension Plans | International Plans | Other, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 317.0 | 357.1 |
Pension Plans | International Plans | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 123.6 | 29.2 |
Pension Plans | International Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 29.6 | 25.1 |
Pension Plans | International Plans | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2.0 | 19.9 |
Pension Plans | International Plans | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (2.3) | (1.5) |
Pension Plans | International Plans | Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,229.8 | 1,173.8 |
Pension Plans | International Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 29.5 | 46.5 |
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 | 2.6 |
Pension Plans | International Plans | Level 1 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.0 | 0.4 |
Pension Plans | International Plans | Level 1 | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 29.6 | 25.1 |
Pension Plans | International Plans | Level 1 | Receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 2.0 | 19.9 |
Pension Plans | International Plans | Level 1 | Payables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | (2.3) | (1.5) |
Pension Plans | International Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,076.6 | 991.5 |
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 | 165.6 | 84.0 |
Pension Plans | International Plans | Level 2 | Other Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 145.3 | 251.5 |
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 321.4 | 267.5 |
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1.3 | 1.0 |
Pension Plans | International Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 1.2 |
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 | 2.4 |  |
Pension Plans | International Plans | Level 2 | Other, Commingled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 317.0 | 357.1 |
Pension Plans | International Plans | Level 2 | Pooled Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 123.6 | 29.2 |
Pension Plans | International Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 123.7 | 135.8 |
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 | 123.7 | 135.8 | 116.2
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 1,309.6 | 1,660.1 |
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 | 454.9 | 780.7 |
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 | 814.0 | 837.7 |
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 | 23.9 | 25.2 |
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 | 16.8 | 16.5 |
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 | 7.8 | 7.6 | 7.9
Other Postretirement Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 7.6 |
Other Postretirement Plans | Level 3 | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets |  | 7.6 |
Other Postretirement Plans | U.S. Plans | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 7.8 |  |
Other Postretirement Plans | U.S. Plans | Level 3 | Insurance Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 7.8 | $ 7.6 | $ 7.9

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