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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, 2016 | Dec. 31, 2015
U.S. Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 3,759.4 | $ 4,069.7
Fair value of plan assets at end of year | 3,452.1 | 3,759.4
Other Postretirement Benefit Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7.7 | 9.1
Fair value of plan assets at end of year | 7.9 | 7.7
Other Postretirement Benefit Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7.7 |
Fair value of plan assets at end of year | 7.9 | 7.7
International Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2,496.8 | 2,718.9
Fair value of plan assets at end of year | 2,429.7 | 2,496.8
International Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 120.6 |
Fair value of plan assets at end of year | 116.2 | 120.6
Level 3 | U.S. Plans |  |
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
Level 3 | U.S. Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0.0 | 17.4
Realized gains (losses) |  | (0.4)
Purchases or acquisitions |  | 0.0
Sales or dispositions |  | (16.6)
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2016 |  | (0.4)
Fair value of plan assets at end of year |  | 0.0
Level 3 | Other Postretirement Benefit Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7.7 | 7.3
Realized gains (losses) | (0.3) | (0.1)
Purchases or acquisitions | 0.5 | 0.5
Sales or dispositions | 0.0 | 0.0
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2016 | 0.0 | 0.0
Fair value of plan assets at end of year | 7.9 | 7.7
Level 3 | International Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 120.6 |
Fair value of plan assets at end of year | 116.2 | 120.6
Level 3 | International Plans | Insurance Contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 120.6 | 135.5
Realized gains (losses) | 0.0 | 0.0
Purchases or acquisitions | 4.7 | 9.4
Sales or dispositions | (11.0) | (10.9)
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2016 | 1.9 | (13.4)
Fair value of plan assets at end of year | $ 116.2 | $ 120.6

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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + 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)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + 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)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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- Definition The amount of increase in the plan assets attributed to a 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=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary. + 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=65897934&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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: 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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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