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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, 2017 | Dec. 31, 2016
U.S. Plans |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 238.2 | $ 164.8
Unfunded Commit-ments | 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 | $ 0.0 | 0.0
Redemption Notice Period Range | 90 days |
U.S. Plans | Debt Securities, Commingled Funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 19.8 | 18.6
Unfunded Commit-ments | $ 0.0 | $ 0.0
Redemption Notice Period Range | 5 days | 5 days
U.S. Plans | Other, Commingled Funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 105.1 | $ 104.6
Unfunded Commit-ments | $ 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] |  |
Fair Value | $ 112.4 | $ 40.5
Unfunded Commit-ments | $ 0.0 | $ 0.0
Redemption Notice Period Range |  | 60 days
Limited partnerships, period expected to make all distributions | 3 years |
U.S. Plans | Private Equity |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 0.9 | $ 1.1
Unfunded Commit-ments | $ 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 | $ 1,660.1 | 1,434.2
Unfunded Commit-ments | 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 | 780.7 | 726.7
Unfunded Commit-ments | $ 0.0 | $ 0.0
Redemption Notice Period Range | 30 days | 90 days
International Plans | Debt Securities, Commingled Funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 837.7 | $ 640.0
Unfunded Commit-ments | $ 0.0 | $ 0.0
Redemption Notice Period Range | 30 days | 90 days
International Plans | Other, Commingled Funds |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 25.2 | $ 25.8
Unfunded Commit-ments | $ 0.0 | $ 0.0
Redemption Notice Period Range | 30 days | 90 days
International Plans | Private Real Estate |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 16.5 | $ 41.7
Unfunded Commit-ments | $ 0.0 | $ 0.0
Redemption Notice Period Range | 90 days | 90 days
International Plans | Private Equity |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 0.0 | $ 0.0

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- Definition Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets + References No definition available. + Details
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- Definition Distributions Per Limited Partnership, Expected Distribution Period + References No definition available. + Details
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- Definition Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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