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Hedging transactions and derivative financial instruments Hedging transactions and derivative financial instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2019 | Jun. 30, 2019 | Jan. 31, 2019
Derivative [Line Items] |  |  |  |  |  |
Reclassification from AOCI | $ (172.2) | $ (30.3) | $ 44.1 |  |  |
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Reclassification from AOCI | (27.5) | $ 0.0 | $ 0.0 |  |  |
Foreign currency contracts | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Reclassification from AOCI | (27.0) |  |  |  |  |
Interest rate swaps | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Reclassification from AOCI | (1.0) |  |  |  |  |
Net investment hedging | Foreign currency contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, original notional amount | 1,875.0 |  |  |  |  | $ 1,900.0
Derivative, notional amount | 1,000.0 |  |  |  |  |
Cash flow hedging | Foreign currency contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, original notional amount | 4,000.0 |  |  | $ 4,000.0 |  |
Derivative, notional amount | 4,000.0 |  |  |  |  |
Cash flow hedging | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, original notional amount | 850.0 |  |  |  | $ 850.0 |
Derivative, notional amount | $ 0.0 |  |  |  |  |

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