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Leases (Maturities of Lease Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Mar. 31, 2019
Operating Leases
Six months ended March 31, 2020	$ 18.1
Year ending March 31, 2021	35.8
Year ending March 31, 2022	33.1
Year ending March 31, 2023	32.4
Year ending March 31, 2024	20.3
Thereafter	59.9
Total lease payments	199.6
Less imputed interest	(25.4)
Total	174.2
Finance Leases
Six months ended March 31, 2020	3.2
Year ending March 31, 2021	6.2
Year ending March 31, 2022	3.9
Year ending March 31, 2023	3.9
Year ending March 31, 2024	3.9
Thereafter	73.5
Total lease payments	94.6
Less imputed interest	(50.7)
Total	$ 43.9	$ 45.4

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