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Leases (Balance Sheet Information, Leases) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019
Operating Leases
Operating Leases, Right-of-use assets	$ 151.5	$ 0.0
Operating Lease, Liabilities	179.9
Finance Leases
Finance Lease, Liabilities	$ 44.7	$ 45.4
Operating leases, weighted average remaining lease term	6 years 8 months 12 days
Finance leases, weighted average remaining lease term	21 years 10 months 24 days
Operating leases, weighted average discount rate, percent	4.11%
Finance leases, weighted average discount rate, percent	6.42%
Other Non-Current Assets
Operating Leases
Operating Leases, Right-of-use assets	$ 151.5
Accounts Payable and Accrued Liabilities
Operating Leases
Operating Leases, Liabilities, current	29.0
Other Non-Current Liabilities
Operating Leases
Operating Leases, Liabilities, non-current	150.9
Property and equipment, net
Finance Leases
Finance Leases, Right-of-Use assets	49.5
Debt - short-term portion
Finance Leases
Finance Lease, Liabilities, Current	3.0
Debt - non-current
Finance Leases
Finance Lease, Liabilities, Non-current	$ 41.7

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