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Employee plans - Additional Information About Plan Assets Valued Using Net Asset Value (Details) - Pension Plans - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
U.S. Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 3,112.8 | $ 3,578.4 | $ 3,452.1
Unfunded Commitments | 0.0 | 0.0 |
U.S. Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 494.8 | 584.4 |
U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 196.6 |  |
Unfunded Commitments | 0.0 | $ 0.0 |
Redemption Notice Period Range |  | 5 days |
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 |
U.S. Plans | Private Real Estate |  |  |
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 | 1 year |  |
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 |  |
International Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 2,539.4 | 2,833.9 | $ 2,429.7
Unfunded Commitments | 0.0 | 0.0 |
International Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 165.6 | 84.0 |
Unfunded Commitments | 0.0 | 0.0 |
International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 321.4 | 267.5 |
Unfunded Commitments | 0.0 | 0.0 |
International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 317.0 | 357.1 |
Unfunded Commitments | 0.0 | 0.0 |
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 | U.S. Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 289.9 | 238.2 |
Plan assets measured using NAV as a practical expedient | 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 | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 0.0 | 19.8 |
Plan assets measured using NAV as a practical expedient | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 110.2 | 105.1 |
Plan assets measured using NAV as a practical expedient | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 179.1 | 112.4 |
Plan assets measured using NAV as a practical expedient | U.S. Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 0.6 | 0.9 |
Plan assets measured using NAV as a practical expedient | International Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 1,309.6 | 1,660.1 |
Plan assets measured using NAV as a practical expedient | International Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 454.9 | 780.7 |
Plan assets measured using NAV as a practical expedient | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 814.0 | 837.7 |
Plan assets measured using NAV as a practical expedient | International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 23.9 | 25.2 |
Plan assets measured using NAV as a practical expedient | International Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 16.8 | 16.5 |
Plan assets measured using NAV as a practical expedient | International Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 0.0 | $ 0.0 |
Minimum | U.S. Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 60 days |  |
Maximum | U.S. Plans | Equity Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 90 days | 90 days |
Maximum | 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 | 30 days |
Maximum | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 30 days | 30 days |
Maximum | 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 | 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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