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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Maturity Date Sep. 30, 2021  
Derivative, Cap Interest Rate 0.75%  
Derivative, Fixed Interest Rate 2.341%  
Derivative, Notional Amount $ 150.0  
Secured Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.56%  
Derivative, Amount of Hedged Item $ 150.0  
Cash Flow Hedging [Member] | Secured Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.841%  
Foreign Exchange Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other noncurrent liabilities $ 1.3 $ 0.0
Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities 1.2 2.0
Other noncurrent liabilities 1.3 5.3
Derivative Liability $ 2.5 $ 7.3