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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	Dec. 31, 2020	Mar. 31, 2020
Assets:
Interest rate swaps	$ 9.9	$ 0.0
Other Non-Current Assets
Assets:
Interest rate swaps	9.9
Other Non-Current Assets | Interest rate swaps, financing element
Liabilities:
Financing element of certain hybrid instruments	100.7
Fair Value, Measurements, Recurring
Assets:
Available-for-sale equity securities	2.1	0.6
Forward exchange contracts	2.3	0.6
Interest rate swaps	110.5	0.0
Liabilities:
Forward exchange contracts	(1.0)	(0.9)
Interest rate swaps	(121.1)	(187.9)
Fair Value, Measurements, Recurring | Level 1
Assets:
Available-for-sale equity securities	2.1	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 equity securities	0.0	0.0
Forward exchange contracts	2.3	0.6
Interest rate swaps	110.5	0.0
Liabilities:
Forward exchange contracts	(1.0)	(0.9)
Interest rate swaps	$ (121.1)	$ (187.9)

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