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DEBT (Details)
$ in Millions
6 Months Ended
Mar. 22, 2018
USD ($)
Jun. 29, 2017
USD ($)
Feb. 28, 2017
USD ($)
Jan. 12, 2017
USD ($)
Dec. 15, 2016
USD ($)
subsidiary
Jun. 30, 2018
USD ($)
subsidiary
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument                
Proceeds from long-term debt           $ 300.0 $ 1,944.2  
Up-front fee (as percent) 0.05              
Deferred financing costs           5.8    
Borrowings outstanding           $ 1,214.1   $ 1,237.9
Term Loan Agreement                
Debt Instrument                
Debt instrument face amount $ 300.0       $ 1.0      
Proceeds from long-term debt $ 300.0              
Minimum consolidated interest ratio           4.00    
Maximum consolidated leverage ratio           3.50    
Borrowings outstanding           $ 270.4    
Term Loan Agreement | LIBOR | Minimum                
Debt Instrument                
Variable interest rate 1.00%              
Term Loan Agreement | LIBOR | Maximum                
Debt Instrument                
Variable interest rate 1.50%              
Term Loan Agreement | Prime Rate | Minimum                
Debt Instrument                
Variable interest rate 0.00%              
Term Loan Agreement | Prime Rate | Maximum                
Debt Instrument                
Variable interest rate 0.50%              
3.650% Senior Notes                
Debt Instrument                
Debt instrument face amount   $ 300.0   $ 650.0        
Interest rate       3.65%       3.65%
Redemption price       101.00%        
Borrowings outstanding           $ 644.2   $ 643.8
Revolving Credit Agreement                
Debt Instrument                
Credit facility, maximum borrowing capacity         $ 150.0      
Minimum consolidated interest ratio           4.00    
Maximum consolidated leverage ratio           3.50    
Term of facility         5 years      
Maximum borrowing capacity, increase limit         $ 100.0      
Maximum borrowing capacity, total with increase         $ 250.0      
Number of subsidiaries that may be designated as additional borrowers | subsidiary         1      
Number of subsidiaries designated as additional borrowers | subsidiary           0    
Borrowings outstanding           $ 0.0    
Borrowing capacity available           150.0    
Revolving Credit Agreement | LIBOR | Minimum                
Debt Instrument                
Variable interest rate         1.00%      
Revolving Credit Agreement | LIBOR | Maximum                
Debt Instrument                
Variable interest rate         1.75%      
Revolving Credit Agreement | Prime Rate | Minimum                
Debt Instrument                
Variable interest rate         0.00%      
Revolving Credit Agreement | Prime Rate | Maximum                
Debt Instrument                
Variable interest rate         0.75%      
Revolving Credit Agreement | Line of Credit                
Debt Instrument                
Credit facility, maximum borrowing capacity         $ 25.0      
1.950% Senior Notes                
Debt Instrument                
Debt instrument face amount   $ 300.0            
Interest rate   1.95%           1.95%
Deferred financing costs   $ 0.8            
Debt issuance costs           0.9    
Redemption price   101.00%            
Borrowings outstanding           $ 299.5   $ 299.2
Prior Term Loan Agreement                
Debt Instrument                
Debt instrument face amount $ 300.0       $ 1,000.0      
Proceeds from long-term debt     $ 1,000.0          
Term of facility     5 years          
Borrowings outstanding               $ 294.9
Prior Term Loan Agreement | Minimum                
Debt Instrument                
Ticking fee         0.10%      
Prior Term Loan Agreement | Maximum                
Debt Instrument                
Ticking fee           0.30%    
Prior Term Loan Agreement | LIBOR | Minimum                
Debt Instrument                
Variable interest rate         1.00%      
Prior Term Loan Agreement | LIBOR | Maximum                
Debt Instrument                
Variable interest rate         1.75%      
Prior Term Loan Agreement | Prime Rate | Minimum                
Debt Instrument                
Variable interest rate         0.00%      
Prior Term Loan Agreement | Prime Rate | Maximum                
Debt Instrument                
Variable interest rate         0.75%