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Derivative Instruments and Hedging Activities (Interest Rate Swaps) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020
Derivative [Line Items] |  |  |  |  |  |
Unrealized losses in AOCI at time of de-designation | $ (2,794.6) | $ (2,735.4) | $ (2,750.4) | $ (2,747.1) | $ (2,714.3) | $ (2,660.0)
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount, de-designated | 1,400.0 |  |  |  |  |
Interest rate swaps | Accumulated Gain (Loss), Net, Cash Flow Hedge Discontinued, Including Noncontrolling Interest |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Unrealized losses in AOCI at time of de-designation | 163.0 |  |  |  |  |
Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | 1,700.0 |  |  |  |
Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | 1,400.0 |  |  |  |
Notional amount entered into during period | $ 1,400.0 |  |  |  |  |
Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018 | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | $ 300.0 |  |  |  |
Fixed Rate Paid or Received |  | 2.915% |  |  |  |
Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | $ 700.0 |  |  |  |
Fixed Rate Paid or Received |  | 2.915% |  |  |  |
Interest Rate Swap, Fixed Rate Paid 1.923%, Effective Date May 19, 2020 | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
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 | Interest rate swaps |  |  |  |  |  |
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 | Interest rate swaps |  |  |  |  |  |
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 | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | $ 200.0 |  |  |  |
Fixed Rate Paid or Received |  | 1.84% |  |  |  |
Interest Rate Swap, Fixed Rate Paid 2.723%, Effective Date June 25, 2018 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
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 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
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 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
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 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
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 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
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 | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | $ 700.0 |  |  |  |
Fixed Rate Paid or Received |  | 2.915% |  |  |  |
Interest Rate Swap, Fixed Rate Received 2.723%, Effective Date August 14, 2020 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | $ 200.0 |  |  |  |
Fixed Rate Paid or Received |  | 2.723% |  |  |  |
Interest Rate Swap, Fixed Rate Received 2.885%, Effective Date May 19, 2020 | Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
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 | Interest rate swaps |  |  |  |  |  |
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 | Interest rate swaps |  |  |  |  |  |
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 | Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | $ 50.0 |  |  |  |
Fixed Rate Paid or Received |  | 2.728% |  |  |  |

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