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Stockholders' equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ (1,647.4) | $ (1,378.6) | $ (1,452.4)
Other comprehensive income before reclassifications | 506.8 | (64.9) | 346.2
Amounts reclassified from accumulated other comprehensive income | (169.8) | (142.6) | (178.1)
Current period other comprehensive income | 337.0 | (207.5) | 168.1
Ending Balance | (1,326.5) | (1,647.4) | (1,378.6)
Total |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (4,152.8) | (3,945.3) | (4,113.4)
Ending Balance | (3,815.8) | (4,152.8) | (3,945.3)
Translation Adjustments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (927.1) | (833.8) | (737.8)
Other comprehensive income before reclassifications | 121.9 | (93.3) | (96.0)
Amounts reclassified from accumulated other comprehensive income | (11.8) | 0.0 | 0.0
Current period other comprehensive income | 110.1 | (93.3) | (96.0)
Ending Balance | (817.0) | (927.1) | (833.8)
Postretirement Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (3,225.7) | (3,111.5) | (3,375.6)
Other comprehensive income before reclassifications | 384.9 | 28.4 | 442.2
Amounts reclassified from accumulated other comprehensive income | (158.0) | (142.6) | (178.1)
Current period other comprehensive income | 226.9 | (114.2) | 264.1
Ending Balance | $ (2,998.8) | $ (3,225.7) | $ (3,111.5)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details
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