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Financial Instruments (Derivatives by Balance Sheet Location) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 32.0 $ 50.8
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 3.5 1.5
Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 32.0 50.8
Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.8 2.6
Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 17.4 132.7
Interest Rate Swap, Financing | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Financing element of certain hybrid instruments 88.1 98.2
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 3.5 1.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 2.8 2.6
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0 0.0
Designated as Hedging Instrument | Interest Rate Swap | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0 0.0
Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 109.1 72.7
Designated as Hedging Instrument | Interest Rate Swap | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0 0.0
Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability (39.4) 5.6
Not Designated as Hedging Instrument | Interest Rate Swap | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0 0.0
Not Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset (77.1) (21.9)
Not Designated as Hedging Instrument | Interest Rate Swap | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0 0.0
Not Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 56.8 127.1
Not Designated as Hedging Instrument | Interest Rate Swap, Financing | Other Non-Current Assets    
Derivatives, Fair Value [Line Items]    
Financing element of certain hybrid instruments 88.1 98.2
Not Designated as Hedging Instrument | Interest Rate Swap, Financing | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Financing element of certain hybrid instruments $ 46.0 $ 54.3