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Employee plans - Summary of Changes in Level 3 Fair Value of Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Other Postretirement Benefit Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 7.9 | $ 7.7
Fair value of plan assets at end of year | 7.6 | 7.9
Other Postretirement Benefit Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7.9 |
Fair value of plan assets at end of year |  | 7.9
Other Postretirement Benefit Plans | Level 3 | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7.9 |
Fair value of plan assets at end of year |  | 7.9
U.S. Plans | Pension Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 3,452.1 | 3,759.4
Fair value of plan assets at end of year | 3,578.4 | 3,452.1
U.S. Plans | Pension Plans | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0.0 |
Fair value of plan assets at end of year | 0.0 | 0.0
U.S. Plans | Other Postretirement Benefit Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at end of year | 7.6 |
U.S. Plans | Other Postretirement Benefit Plans | Level 3 | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7.9 | 7.7
Realized gains (losses) | (0.2) | (0.3)
Purchases or acquisitions | 0.2 | 0.5
Sales or dispositions | (0.3) | 0.0
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2017 | 0.0 | 0.0
Fair value of plan assets at end of year | 7.6 | 7.9
International Plans | Pension Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2,429.7 | 2,496.8
Fair value of plan assets at end of year | 2,833.9 | 2,429.7
International Plans | Pension Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 116.2 |
Fair value of plan assets at end of year | 135.8 | 116.2
International Plans | Pension Plans | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 116.2 |
Fair value of plan assets at end of year | 135.8 | 116.2
International Plans | Pension Plans | Level 3 | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 116.2 | 120.6
Realized gains (losses) | 0.0 | 0.0
Purchases or acquisitions | 10.8 | 4.7
Sales or dispositions | (11.4) | (11.0)
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2017 | 20.2 | 1.9
Fair value of plan assets at end of year | $ 135.8 | $ 116.2

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in plan assets of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in plan assets of defined benefit plan from disposal or classification as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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