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Fair Value Measurements (Assets and Liabilities Required to Be Carried at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Assets:
Interest rate swaps	$ 50.8	$ 0.0
Other Non-Current Assets
Assets:
Interest rate swaps	50.8
Other Non-Current Assets | Interest Rate Swap, Financing
Liabilities:
Financing element of certain hybrid instruments	98.2
Fair Value, Measurements, Recurring
Assets:
Available-for-sale securities	1.8	0.6
Forward exchange contracts	1.5	0.6
Interest rate swaps	149.0	0.0
Liabilities:
Forward exchange contracts	(2.6)	(0.9)
Interest rate swaps	(78.4)	(187.9)
Fair Value, Measurements, Recurring | Level 1
Assets:
Available-for-sale securities	1.8	0.6
Forward exchange contracts	0.0	0.0
Interest rate swaps	0.0	0.0
Liabilities:
Forward exchange contracts	0.0	0.0
Interest rate swaps	0.0	0.0
Fair Value, Measurements, Recurring | Level 2
Assets:
Available-for-sale securities	0.0	0.0
Forward exchange contracts	1.5	0.6
Interest rate swaps	149.0	0.0
Liabilities:
Forward exchange contracts	(2.6)	(0.9)
Interest rate swaps	$ (78.4)	$ (187.9)

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