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Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]    
Current contract assets $ 10.7 $ 4.0
Current contract liabilities (deferred revenue) 24.6 56.9
Noncurrent contract liabilities (deferred revenue) $ 11.7 $ 20.5