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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of long-term debt $ 1,238.1 $ 1,361.8
Property, plant and equipment, net 383.0 $ 396.5
Facility Closing    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, plant and equipment, net $ 5.6