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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%