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Indebtedness (Detail Textuals) - Senior Secured Credit Facilities - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 20, 2017
Oct. 17, 2017
Apr. 26, 2017
Dec. 31, 2018
Dec. 31, 2017
Oct. 16, 2017
Debt Instrument [Line Items]            
Mandatory payments related to senior secured credit facilities       $ 87.5 $ 91.7  
Term Loan A | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       1.75%    
Revolving Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate [1]       1.75%    
Term Loan B3 | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate       2.25%    
Third Amendment            
Debt Instrument [Line Items]            
Cash that can be used to offset indebtedness   $ 500.0       $ 200.0
Third Amendment | Term Loan A            
Debt Instrument [Line Items]            
Debt instrument, maturity date   Oct. 17, 2022        
Third Amendment | Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, maturity date   Oct. 17, 2022        
Third Amendment | Refinancing Term Loan A            
Debt Instrument [Line Items]            
Line of credit facility   $ 391.0        
Third Amendment | Refinancing Term Loan A1 Facility            
Debt Instrument [Line Items]            
Line of credit facility   1,250.0        
Third Amendment | Refinancing Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility   $ 500.0        
Fourth Amendment            
Debt Instrument [Line Items]            
Cash that can be used to offset indebtedness $ 500.0          
Fourth Amendment | Term Loan B3            
Debt Instrument [Line Items]            
Loan facility principal amount $ 542.3          
Debt instrument, maturity date Apr. 26, 2024          
Second Amendment | Term Loan B2 Facility            
Debt Instrument [Line Items]            
Debt instrument, maturity date     Apr. 30, 2024      
Capitalized financing fees     $ 1.4      
Original issuance discount     4.5      
Expensed Amount of debt discount costs     4.5      
Write off amount of debt discount costs     1.3      
Second Amendment | Term Loan B3            
Debt Instrument [Line Items]            
Loan facility principal amount     $ 545.0      
Minimum | Fourth Amendment | Term Loan B3 | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 2.00%          
Minimum | Fourth Amendment | Term Loan B3 | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 1.00%          
Minimum | Second Amendment | Term Loan B2 Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     2.25%      
Minimum | Second Amendment | Term Loan B2 Facility | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     1.25%      
Maximum | Third Amendment            
Debt Instrument [Line Items]            
Consolidated net leverage ratio   400.00%        
Maximum | Third Amendment | Fiscal Quarter Ending March 31, 2019            
Debt Instrument [Line Items]            
Consolidated net leverage ratio   375.00%        
Maximum | Fourth Amendment | Term Loan B3 | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 2.25%          
Maximum | Fourth Amendment | Term Loan B3 | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 1.25%          
Maximum | Second Amendment | Term Loan B2 Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     2.50%      
Maximum | Second Amendment | Term Loan B2 Facility | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     1.50%      
[1] Includes unused commitment fee of 0.30% and letter of credit fee of 1.75% not reflected in interest rate above.