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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	Jun. 30, 2021	Mar. 31, 2021
Assets:
Interest rate swaps	$ 24.1	$ 50.8
Other Non-Current Assets
Assets:
Interest rate swaps	24.1	50.8
Other Non-Current Assets | Interest rate swaps, financing element
Liabilities:
Financing element of certain hybrid instruments	95.7	98.2
Fair Value, Measurements, Recurring
Assets:
Available-for-sale equity securities	1.1	1.8
Forward exchange contracts	0.5	1.5
Interest rate swaps	119.8	149.0
Liabilities:
Forward exchange contracts	(1.5)	(2.6)
Interest rate swaps	(81.8)	(78.4)
Fair Value, Measurements, Recurring | Level 1
Assets:
Available-for-sale equity securities	1.1	1.8
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	0.5	1.5
Interest rate swaps	119.8	149.0
Liabilities:
Forward exchange contracts	(1.5)	(2.6)
Interest rate swaps	$ (81.8)	$ (78.4)

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