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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Leases [Abstract]      
Rent expense on operating leases $ 16.0 $ 15.3 $ 14.7
Operating leases minimum payment in 2019 13.5    
Operating leases minimum payment in 2020 9.7    
Operating leases minimum payment in 2021 8.2    
Operating leases minimum payment in 2022 5.3    
Operating leases minimum payment in 2023 4.5    
Operating leases minimum payment after 2023 $ 10.3