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Derivative Instruments and Hedging Activities - Interest Rate Swaps (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2024
Cash Flow Hedging | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount $ 1,700.0    
Cash Flow Hedging | Tranche One | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount 300.0    
Cash Flow Hedging | Tranche Two | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount 700.0    
Cash Flow Hedging | Tranche Three | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount 200.0    
Cash Flow Hedging | Tranche Four | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount 300.0    
Cash Flow Hedging | Tranche Five | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount 50.0    
Cash Flow Hedging | Tranche Six | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount 100.0    
Cash Flow Hedging | Tranche Seven | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount 50.0    
Designated as Hedging Instrument | Interest rate swaps      
Derivative [Line Items]      
Notional Amount $ 1,920.0   $ 1,920.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018      
Derivative [Line Items]      
Fixed Rate Paid (as percent) 2.915%   2.915%
Notional Amount $ 300.0   $ 300.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap 2, Fixed Rate Paid 2.915%, Effective Date May 23, 2018      
Derivative [Line Items]      
Fixed Rate Paid (as percent) 2.915%   2.915%
Notional Amount $ 700.0   $ 700.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.723%, Effective Date June 25, 2018      
Derivative [Line Items]      
Fixed Rate Paid (as percent) 2.723%   2.723%
Notional Amount $ 200.0   $ 200.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.885%, Effective Date July 31, 2018      
Derivative [Line Items]      
Fixed Rate Paid (as percent) 2.885%   2.885%
Notional Amount $ 300.0   $ 300.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.744%, Effective Date December 24, 2018      
Derivative [Line Items]      
Fixed Rate Paid (as percent) 2.744%   2.744%
Notional Amount $ 50.0   $ 50.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.808%, Effective Date December 24, 2018      
Derivative [Line Items]      
Fixed Rate Paid (as percent) 2.808%   2.808%
Notional Amount $ 100.0   $ 100.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 2.728%, Effective Date December 24, 2018      
Derivative [Line Items]      
Fixed Rate Paid (as percent) 2.728%   2.728%
Notional Amount $ 50.0   $ 50.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 4.045%, Effective Date August 15, 2024      
Derivative [Line Items]      
Fixed Rate Paid (as percent) [1]     4.045%
Notional Amount [1]     $ 65.0
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.803%, Effective Date August 15, 2024      
Derivative [Line Items]      
Fixed Rate Paid (as percent) [1]     3.803%
Notional Amount [1]     $ 77.5
Designated as Hedging Instrument | Interest rate swaps | Interest Rate Swap, Fixed Rate Paid 3.810%, Effective Date August 15, 2024      
Derivative [Line Items]      
Fixed Rate Paid (as percent) [1]     3.81%
Notional Amount [1]     $ 77.5
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swaption      
Derivative [Line Items]      
Notional Amount   $ 1,700.0  
Designated as Hedging Instrument | Cash Flow Hedging | Tranche One | Interest Rate Swaption      
Derivative [Line Items]      
Effective Date May 23, 2018 May 23, 2018  
Notional Amount   $ 300.0  
Fixed Rate Paid (as percent) 2.915% 2.915%  
Maturity Date Mar. 24, 2025 Mar. 24, 2025  
Designated as Hedging Instrument | Cash Flow Hedging | Tranche Two | Interest Rate Swaption      
Derivative [Line Items]      
Effective Date May 23, 2018 May 23, 2018  
Notional Amount   $ 700.0  
Fixed Rate Paid (as percent) 2.915% 2.915%  
Maturity Date [2] Mar. 24, 2025 Mar. 24, 2025  
Designated as Hedging Instrument | Cash Flow Hedging | Tranche Three | Interest Rate Swaption      
Derivative [Line Items]      
Effective Date Jun. 25, 2018 Jun. 25, 2018  
Notional Amount   $ 200.0  
Fixed Rate Paid (as percent) 2.723% 2.723%  
Maturity Date [2] Mar. 23, 2025 Mar. 23, 2025  
Designated as Hedging Instrument | Cash Flow Hedging | Tranche Four | Interest Rate Swaption      
Derivative [Line Items]      
Effective Date Jul. 31, 2018 Jul. 31, 2018  
Notional Amount   $ 300.0  
Fixed Rate Paid (as percent) 2.885% 2.885%  
Maturity Date [2] Mar. 23, 2025 Mar. 23, 2025  
Designated as Hedging Instrument | Cash Flow Hedging | Tranche Five | Interest Rate Swaption      
Derivative [Line Items]      
Effective Date Dec. 24, 2018 Dec. 24, 2018  
Notional Amount   $ 50.0  
Fixed Rate Paid (as percent) 2.744% 2.744%  
Maturity Date [2] Mar. 23, 2025 Mar. 23, 2025  
Designated as Hedging Instrument | Cash Flow Hedging | Tranche Six | Interest Rate Swaption      
Derivative [Line Items]      
Effective Date Dec. 24, 2018 Dec. 24, 2018  
Notional Amount   $ 100.0  
Fixed Rate Paid (as percent) 2.808% 2.808%  
Maturity Date [2] Mar. 23, 2025 Mar. 23, 2025  
Designated as Hedging Instrument | Cash Flow Hedging | Tranche Seven | Interest Rate Swaption      
Derivative [Line Items]      
Effective Date Dec. 24, 2018 Dec. 24, 2018  
Notional Amount   $ 50.0  
Fixed Rate Paid (as percent) 2.728% 2.728%  
Maturity Date [2] Mar. 23, 2025 Mar. 23, 2025  
[1] Entered into during the three months ended September 30, 2024.
[2] Represents the re-designated swaps as described in the May 2022 Transactions section below that were previously not designated cash flow hedges at March 31, 2022