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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 60 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2021
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]              
Other noncurrent assets $ 1.5   $ 1.5     $ 0.0  
Interest Rate Derivative Assets, at Fair Value 1.5   1.5     0.0  
Other current liabilities $ 0.0   $ 0.0     1.2  
Derivative, Cap Interest Rate             0.75%
Derivative, Fixed Interest Rate 2.341%   2.341%        
Derivative, Amount of Hedged Item $ 150.0   $ 150.0        
Other noncurrent liabilities 0.0   0.0     1.3  
Interest Rate Derivatives, at Fair Value, Net 0.0   0.0     2.5  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 0.2 $ 0.5 0.6 $ 1.1      
Other noncurrent liabilities 1.0   1.0     $ 1.3  
Secured Debt [Member]              
Derivative [Line Items]              
Long-term Debt, Gross $ 500.0   $ 500.0        
Debt Instrument, Interest Rate, Effective Percentage 4.78%   4.78%        
Debt Instrument, Basis Spread on Variable Rate     25000.00%        
Scenario, Forecast [Member]              
Derivative [Line Items]              
HedgePeriodStart         Sep. 30, 2016    
Derivative, Maturity Date         Sep. 30, 2021    
Cash Flow Hedging [Member] | Secured Debt [Member]              
Derivative [Line Items]              
Long-term Debt, Gross $ 150.0   $ 150.0        
Debt Instrument, Interest Rate, Effective Percentage 4.841%   4.841%