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Credit Agreement (Details)
$ in Millions
12 Months Ended
May 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
covenants
Feb. 08, 2011
USD ($)
Line of Credit Facility [Line Items]      
Line of Credit Facility, Fair Value of Amount Outstanding $ 105.0 $ 86.3  
Bank Of America February Two Thousand Eleven New Credit Agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 200.0
Option to increase maximum borrowing capacity 200.0    
Term of agreement   5 years  
Commitment fee rate   0.175%  
Line of Credit Facility, Fair Value of Amount Outstanding   $ 10.8  
Letter of Credit Facility, Number of Covenants | covenants   2  
Bank Of America February Two Thousand Eleven New Credit Agreement | Minimum      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.15%  
Bank Of America February Two Thousand Eleven New Credit Agreement | Maximum      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.30%  
Long-term Debt | Bank Of America February Two Thousand Eleven New Credit Agreement      
Line of Credit Facility [Line Items]      
Term loan   $ 150.0  
Line of Credit | Revolving Credit Facility | Amended Credit Agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 500.0    
Line of Credit | Revolving Credit Facility | Credit Agreement      
Line of Credit Facility [Line Items]      
Proceeds from Lines of Credit $ 105.0    
LIBOR | Bank Of America February Two Thousand Eleven New Credit Agreement      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Interest Rate at Period End   3.897%  
Prime Rate | Bank Of America February Two Thousand Eleven New Credit Agreement      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Interest Rate at Period End   5.875%  
Prime Rate | Bank Of America February Two Thousand Eleven New Credit Agreement | Minimum      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   0.125%  
Prime Rate | Bank Of America February Two Thousand Eleven New Credit Agreement | Maximum      
Line of Credit Facility [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   2.125%