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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Leases [Abstract]      
Rent expense on operating leases $ 17.3 $ 16.0 $ 15.3
Operating leases minimum payment in 2020 13.4    
Operating leases minimum payment in 2021 9.0    
Operating leases minimum payment in 2022 5.8    
Operating leases minimum payment in 2023 4.6    
Operating leases minimum payment in 2024 3.6    
Operating leases minimum payment after 2024 $ 11.4