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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 60 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2021
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]                      
Debt Instrument, Repurchase Date             Jun. 12, 2018        
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   0.0   $ 0.5 0.6 $ 1.5          
Other noncurrent liabilities   0.6     $ 0.6         $ 1.3  
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net $ 2.4   $ 0.0       $ 2.4 $ 0.0      
Secured Debt [Member]                      
Derivative [Line Items]                      
Long-term Debt, Gross $ 500.0           $ 500.0        
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%