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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
Derivative [Line Items] |  |  |  |  |  |  |
Remaining maturity of forward foreign exchange contracts, maximum |  | 12 months |  |  |  |  |
Unrealized losses in AOCI at time of de-designation | $ (2,714.3) | $ (2,714.3) | $ (2,709.5) | $ (2,660.0) | $ (2,842.3) | $ (2,855.0) | $ (2,921.9)
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months | 1.2 | 1.2 |  |  |  |  |
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months | 44.4 | 44.4 |  |  |  |  |
Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest rate swaps, modification, notional amount | $ 200.0 | $ 1,400.0 |  |  |  |  |
Fixed pay rate | 2.25% | 2.25% |  | 2.87% |  |  |
Notational amount, de-designated |  | $ 1,400.0 |  |  |  |  |
Gross amount of swaps in an asset position subject to master netting arrangement | $ 161.3 | 161.3 |  |  |  |  |
Gross amount of swaps in an liability position subject to master netting arrangement | 276.4 | 276.4 |  |  |  |  |
Net liability of swaps subject to master netting arrangement | $ 115.1 | $ 115.1 |  |  |  |  |
Minimum | Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Extended maturity |  | 2 years |  |  |  |  |
Maximum | Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Extended maturity |  | 5 years |  |  |  |  |
Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notational amount entered into during period |  | $ 1,400.0 |  |  |  |  |
Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notational amount entered into during period |  | $ 1,400.0 |  |  |  |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge Discontinued, Including Noncontrolling Interest | Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Unrealized losses in AOCI at time of de-designation |  |  |  | $ 163.0 |  |  |

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