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Derivative Instruments - Schedule of Total Outstanding Notional Amount and Fair Value of Derivative Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Interest rate swap contracts    
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 0.3  
Derivative Liabilities   $ 0.4
Derivatives not accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Notional Amount 75.0 100.8
Derivative Assets 0.3 0.4
Derivative Liabilities 0.0 0.0
Derivatives not accounted for as hedges | Interest rate swap contracts    
Derivatives, Fair Value [Line Items]    
Notional Amount 75.0 100.0
Derivative Assets 0.3 0.4
Derivative Liabilities 0.0 0.0
Derivatives not accounted for as hedges | Foreign currency forward contracts    
Derivatives, Fair Value [Line Items]    
Notional Amount 0.0 0.8
Derivative Assets 0.0 0.0
Derivative Liabilities $ 0.0 $ 0.0