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Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Future minimum lease commitments under operating leases [Abstract]      
2020 $ 49.0    
2021 38.2    
2022 30.2    
2023 18.0    
2024 9.1    
Thereafter 22.6    
Total minimum payments 167.1    
Rental expense under operating lease 50.9 $ 30.0 $ 35.4
Property, Plant and Equipment Purchase Commitment      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Purchase commitment, remaining minimum amount committed 18.8    
Wafer Foundry Purchase Commitment      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Purchase commitment, remaining minimum amount committed $ 194.9