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Derivative Instruments and Hedging Activities (Interest Rate Swaps) (Details) - Interest rate swaps - USD ($) $ in Millions | Sep. 30, 2020 | Mar. 31, 2020
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Derivative [Line Items] |  |
Fixed Rate Paid or Received | 2.25% | 2.87%
Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 1,400.0 | $ 1,700.0
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | 1,400.0 |
Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount |  | $ 1,000.0
Fixed Rate Paid or Received |  | 2.915%
Interest Rate Swap, Fixed Rate Paid 2.723%, Effective Date June 25, 2018 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount |  | $ 200.0
Fixed Rate Paid or Received |  | 2.723%
Interest Rate Swap, Fixed Rate Paid 2.885%, Effective Date July 31, 2018 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount |  | $ 300.0
Fixed Rate Paid or Received |  | 2.885%
Interest Rate Swap, Fixed Rate Paid 2.744%, Effective Date December 24, 2018 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount |  | $ 50.0
Fixed Rate Paid or Received |  | 2.744%
Interest Rate Swap, Fixed Rate Paid 2.808%, Effective Date December 24, 2018 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount |  | $ 100.0
Fixed Rate Paid or Received |  | 2.808%
Interest Rate Swap, Fixed Rate Paid 2.728%, Effective Date December 24, 2018 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount |  | $ 50.0
Fixed Rate Paid or Received |  | 2.728%
Interest Rate Swap, Fixed Rate Received 2.915%, Effective Date May 19, 2020 | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 700.0 |
Fixed Rate Paid or Received | 2.915% |
Interest Rate Swap, Fixed Rate Received 2.885%, Effective Date May 19, 2020 | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 300.0 |
Fixed Rate Paid or Received | 2.885% |
Interest Rate Swap, Fixed Rate Received 2.744%, Effective Date May 19, 2020 | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 50.0 |
Fixed Rate Paid or Received | 2.744% |
Interest Rate Swap, Fixed Rate Received 2.808%, Effective Date June 15, 2020 | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 100.0 |
Fixed Rate Paid or Received | 2.808% |
Interest Rate Swap, Fixed Rate Received 2.728%, Effective Date June 15, 2020 | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 50.0 |
Fixed Rate Paid or Received | 2.728% |
Interest Rate Swap, Fixed Rate Received 2.723%, Effective Date August 14, 2020 | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 200.0 |
Fixed Rate Paid or Received | 2.723% |
Interest Rate Swap, Fixed Rate Paid 1.923%, Effective Date May 19, 2020 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 700.0 |
Fixed Rate Paid or Received | 1.923% |
Interest Rate Swap, Fixed Rate Paid 2.531%, Effective Date May 19, 2020 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 350.0 |
Fixed Rate Paid or Received | 2.531% |
Interest Rate Swap, Fixed Rate Paid 2.343%, Effective Date June 15, 2020 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 150.0 |
Fixed Rate Paid or Received | 2.343% |
Interest Rate Swap, Fixed Rate Paid 1.840%, Effective Date August 14, 2020 | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount | $ 200.0 |
Fixed Rate Paid or Received | 1.84% |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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