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Leases - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Operating Leases    
2020 $ 6.4  
2021 10.8  
2022 8.6  
2023 7.5  
2024 5.0  
Thereafter 10.2  
Total future minimum lease payments 48.5  
Less: Imputed interest (5.1)  
Total lease liabilities 43.4  
Finance Leases    
2020 1.0  
2021 1.9  
2022 1.9  
2023 1.9  
2024 1.9  
Thereafter 46.1  
Total future minimum lease payments 54.7  
Less: Imputed interest (27.5)  
Total lease liabilities $ 27.2  
Operating Leases, Topic 840    
2020   $ 14.6
2021   11.8
2022   9.6
2023   8.7
2024   6.4
Thereafter   56.3
Total future minimum lease payments   $ 107.4