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Financial Instruments (Interest Rate Swaps) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Unrealized losses in AOCI at time of de-designation	$ (2,794.6)	$ (2,683.4)	$ (2,660.0)	$ (2,921.9)
Interest Rate Swap
Derivative [Line Items]
Notional amount, de-designated	1,400.0
Interest Rate Swap | 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 Swap
Derivative [Line Items]
Notional amount		1,700.0
Not Designated as Hedging Instrument | Interest Rate Swap
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 Swap
Derivative [Line Items]
Notional amount		$ 300.0
Fixed interest rate		2.915%
Interest Rate Swap, Fixed Rate Paid 2.915%, Effective Date May 23, 2018 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 700.0
Fixed interest rate		2.915%
Interest Rate Swap, Fixed Rate Paid 1.923%, Effective Date May 19, 2020 | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 700.0
Fixed interest rate		1.923%
Interest Rate Swap, Fixed Rate Paid 2.531%, Effective Date May 19, 2020 | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 350.0
Fixed interest rate		2.531%
Interest Rate Swap, Fixed Rate Paid 2.343%, Effective Date June 15, 2020 | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 150.0
Fixed interest rate		2.343%
Interest Rate Swap, Fixed Rate Paid 1.840%, Effective Date August 14, 2020 | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 200.0
Fixed interest rate		1.84%
Interest Rate Swap, Fixed Rate Paid 2.723%, Effective Date June 25, 2018 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 200.0
Fixed interest rate		2.723%
Interest Rate Swap, Fixed Rate Paid 2.885%, Effective Date July 31, 2018 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 300.0
Fixed interest rate		2.885%
Interest Rate Swap, Fixed Rate Paid 2.744%, Effective Date December 24, 2018 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 50.0
Fixed interest rate		2.744%
Interest Rate Swap, Fixed Rate Paid 2.808%, Effective Date December 24, 2018 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 100.0
Fixed interest rate		2.808%
Interest Rate Swap, Fixed Rate Paid 2.728%, Effective Date December 24, 2018 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 50.0
Fixed interest rate		2.728%
Interest Rate Swap, Fixed Rate Received 2.915%, Effective Date May 19, 2020 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 700.0
Fixed interest rate		2.915%
Interest Rate Swap, Fixed Rate Received 2.723%, Effective Date August 14, 2020 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 200.0
Fixed interest rate		2.723%
Interest Rate Swap, Fixed Rate Received 2.885%, Effective Date May 19, 2020 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 300.0
Fixed interest rate		2.885%
Interest Rate Swap, Fixed Rate Received 2.744%, Effective Date May 19, 2020 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 50.0
Fixed interest rate		2.744%
Interest Rate Swap, Fixed Rate Received 2.808%, Effective Date June 15, 2020 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 100.0
Fixed interest rate		2.808%
Interest Rate Swap, Fixed Rate Received 2.728%, Effective Date June 15, 2020 | Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount		$ 50.0
Fixed interest rate		2.728%

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