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Employee plans - Additional Information About Plan Assets Valued Using Net Asset Value (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) fund | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Pension Plans | U.S. Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 3,334.2 | $ 3,112.8 | $ 3,578.4
Unfunded Commitments | 44.4 | 0.0 |
Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 0.0 | 0.0 |
Redemption Notice Period Range | 45 days |  |
Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 0.0 | $ 0.0 |
Redemption Notice Period Range | 5 days | 5 days |
Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 44.4 | $ 0.0 |
Number of funds for which redemption has been requested | fund | 1 |  |
Pension Plans | U.S. Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 0.0 | 0.0 |
Limited partnerships, period expected to make all distributions | 3 years |  |
Pension Plans | International Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 2,816.4 | 2,539.4 | $ 2,833.9
Unfunded Commitments | 117.9 | 0.0 |
Pension Plans | International Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 0.0 | 0.0 |
Pension Plans | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 117.9 | 0.0 |
Pension Plans | International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 0.0 | 0.0 |
Pension Plans | International Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 0.0 | 0.0 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 402.7 | 289.9 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 0.0 | 0.0 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 86.3 | 0.0 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 127.0 | 110.2 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 189.0 | 179.1 |
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 0.4 | 0.6 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 1,404.1 | 1,309.6 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 406.9 | 454.9 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 941.0 | 814.0 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 24.8 | 23.9 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 31.4 | 16.8 |
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 0.0 | $ 0.0 |
Minimum | Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 60 days | 60 days |
Requested redemption, estimated period for full receipt | 3 years |  |
Maximum |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 120 days |  |
Maximum | Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 90 days | 90 days |
Requested redemption, estimated period for full receipt | 4 years |  |
Maximum | Pension Plans | International Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 2 days | 2 days |
Maximum | Pension Plans | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 120 days | 30 days |
Maximum | Pension Plans | International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 30 days | 30 days |
Maximum | Pension Plans | International Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 90 days | 90 days |

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