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Additional Financial Information (Cash Flow Information, Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 48.8	$ 37.1
Operating cash flows for finance leases	1.6	3.4
Financing cash flows for finance leases	2.6	3.0
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	25.0	8.3
Increase in right-of-use assets and lease liability due to a reassessment event:
Operating leases - increase in right-of-use assets	6.0	0.0
Operating leases - increase in lease liability	$ 12.6	$ 0.0

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Right-of-Use Asset Obtained in Exchange for New Lease Obligations

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Amount of interest paid on finance lease liability.

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-Subparagraph (g)(1)
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