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Accumulated other comprehensive income (loss) - Reclasses Out Of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Beginning balance |  | $ 191.8 |  |  | $ 191.8 |
Other comprehensive income (loss) | $ 35.2 | (117.4) | $ 7.1 | $ 2.2 | (82.2) | $ 9.3
Ending balance | 111.3 |  |  |  | 111.3 |
Benefit Plan Adjustments |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Beginning balance |  | (583.0) |  |  | (583.0) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | 3.0 |
Amounts reclassified from accumulated other comprehensive loss to net income |  |  |  |  | 20.3 |
Other comprehensive income (loss) | 8.8 |  | 5.9 |  | 23.3 | 13.4
Ending balance | (559.7) |  |  |  | (559.7) |
Foreign Currency Translation Adjustments |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Beginning balance |  | (382.8) |  |  | (382.8) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (92.7) |
Amounts reclassified from accumulated other comprehensive loss to net income |  |  |  |  | 0.0 |
Other comprehensive income (loss) | 27.2 |  | 9.0 |  | (92.7) | 9.3
Ending balance | (475.5) |  |  |  | (475.5) |
Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Beginning balance |  | (13.2) |  |  | (13.2) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | 3.4 |
Amounts reclassified from accumulated other comprehensive loss to net income |  |  |  |  | (16.8) |
Other comprehensive income (loss) | (1.8) |  | (7.9) |  | (13.4) | (13.8)
Ending balance | (26.6) |  |  |  | (26.6) |
AOCI Attributable to Parent |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Beginning balance |  | (979.0) |  |  | (979.0) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (86.3) |
Amounts reclassified from accumulated other comprehensive loss to net income |  |  |  |  | 3.5 |
Other comprehensive income (loss) | 34.2 | $ (117.0) | $ 7.0 | $ 1.9 | (82.8) | $ 8.9
Ending balance | $ (1,061.8) |  |  |  | $ (1,061.8) |

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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=118930883&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=118951672&loc=d3e1436-108581 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: 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=118951672&loc=d3e1436-108581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 + Details
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