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Stockholders' equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | $ (1,326.5) | $ (1,647.4) | $ (1,378.6)
Reclassification pursuant to ASU No. 2018-02 |  | 0.0 |  |
Other comprehensive income before reclassifications |  | 96.7 | 506.8 | (64.9)
Amounts reclassified from accumulated other comprehensive income |  | (157.0) | (169.8) | (142.6)
Current period other comprehensive income |  | (269.0) | 337.0 | (207.5)
Ending Balance |  | (1,299.6) | (1,326.5) | (1,647.4)
Total |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | (3,815.8) | (4,152.8) | (3,945.3)
Reclassification pursuant to ASU No. 2018-02 | $ (208.7) | (208.7) |  |
Ending Balance |  | (4,084.8) | (3,815.8) | (4,152.8)
Translation Adjustments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | (817.0) | (927.1) | (833.8)
Reclassification pursuant to ASU No. 2018-02 |  | 0.0 |  |
Other comprehensive income before reclassifications |  | (79.7) | 121.9 | (93.3)
Amounts reclassified from accumulated other comprehensive income |  | 0.0 | (11.8) | 0.0
Current period other comprehensive income |  | (79.7) | 110.1 | (93.3)
Ending Balance |  | (896.7) | (817.0) | (927.1)
Postretirement Plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | (2,998.8) | (3,225.7) | (3,111.5)
Reclassification pursuant to ASU No. 2018-02 |  | (208.7) |  |
Other comprehensive income before reclassifications |  | 176.4 | 384.9 | 28.4
Amounts reclassified from accumulated other comprehensive income |  | (157.0) | (158.0) | (142.6)
Current period other comprehensive income |  | (189.3) | 226.9 | (114.2)
Ending Balance |  | $ (3,188.1) | $ (2,998.8) | $ (3,225.7)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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