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Leases (Balance Sheet Information, Leases) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Operating Leases |  |
Operating Leases, Right-of-use assets | $ 146.3 | $ 0.0
Operating Lease, Liabilities | 174.2 |
Finance Leases |  |
Finance Lease, Liabilities | $ 43.9 | $ 45.4
Operating leases, weighted average remaining lease term | 6 years 6 months |
Finance leases, weighted average remaining lease term | 21 years 7 months 6 days |
Operating leases, weighted average discount rate, percent | 4.11% |
Finance leases, weighted average discount rate, percent | 6.41% |
Other Non-Current Assets |  |
Operating Leases |  |
Operating Leases, Right-of-use assets | $ 146.3 |
Accounts Payable and Accrued Liabilities |  |
Operating Leases |  |
Operating Leases, Liabilities, current | 29.5 |
Other Non-Current Liabilities |  |
Operating Leases |  |
Operating Leases, Liabilities, non-current | 144.7 |
Property and equipment, net |  |
Finance Leases |  |
Finance Leases, Right-of-Use assets | 48.7 |
Debt - short-term portion |  |
Finance Leases |  |
Finance Lease, Liabilities, Current | 3.1 |
Debt - non-current |  |
Finance Leases |  |
Finance Lease, Liabilities, Non-current | $ 40.8 |

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