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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 60 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2021
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]          
Other current liabilities $ 0.7     $ 1.2  
Derivative, Cap Interest Rate         0.75%
Derivative, Fixed Interest Rate 2.341%        
Derivative, Amount of Hedged Item $ 150.0        
Other noncurrent liabilities 0.2     1.3  
Interest Rate Derivatives, at Fair Value, Net 0.9     2.5  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 0.4 $ 0.6      
Other noncurrent liabilities 1.3     $ 1.3  
Secured Debt [Member]          
Derivative [Line Items]          
Long-term Debt, Gross $ 500.0        
Debt Instrument, Interest Rate, Effective Percentage 4.60%        
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        
Debt Instrument, Interest Rate, Effective Percentage 4.841%