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Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Future minimum lease commitments under operating leases [Abstract]      
2019 $ 26.0    
2020 18.7    
2021 13.3    
2022 10.2    
2023 1.7    
Thereafter 0.0    
Total minimum payments 69.9    
Rental expense under operating lease 30.0 $ 35.4 $ 23.3
Property, Plant and Equipment Purchase Commitment      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Purchase commitment, remaining minimum amount committed 144.4    
Wafer Foundry Purchase Commitment      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Purchase commitment, remaining minimum amount committed $ 101.6