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Derivative instruments and hedging activities - Cash Flow Hedging on AOCI (Details) - Interest rate swaps - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative Amount of Gain/(Loss) Recognized in OCI on Derivative | $ (16.0) | $ 0.0
Cash Flow Hedging | Interest expense |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income | $ 0.0 | $ 0.0

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- Definition Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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