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Indebtedness - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 20, 2017
Oct. 17, 2017
Apr. 26, 2017
Jun. 30, 2018
Jun. 30, 2018
Oct. 16, 2017
Term Loan B            
Debt Instrument [Line Items]            
Loan facility principal amount     $ 545.0      
Term Loan B2 Facility            
Debt Instrument [Line Items]            
Debt instrument, maturity date     Apr. 30, 2024      
Minimum | Term Loan B2 Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     2.25%      
Minimum | Term Loan B2 Facility | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     1.25%      
Maximum | Term Loan B2 Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     2.50%      
Maximum | Term Loan B2 Facility | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate     1.50%      
Senior Secured Credit Facilities            
Debt Instrument [Line Items]            
Mandatory payments related to senior secured credit facilities       $ 21.9 $ 43.8  
Senior Secured Credit Facilities | Term Loan A | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate         1.75%  
Senior Secured Credit Facilities | Revolving Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate [1]         1.75%  
Senior Secured Credit Facilities | Term Loan B3 Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate         2.25%  
Senior Secured Credit Facilities | Third Amendment            
Debt Instrument [Line Items]            
Cash that can be used to offset indebtedness   $ 500.0       $ 200.0
Senior Secured Credit Facilities | Third Amendment | Term Loan A            
Debt Instrument [Line Items]            
Debt instrument, maturity date   Oct. 17, 2022        
Senior Secured Credit Facilities | Third Amendment | Revolving Facility            
Debt Instrument [Line Items]            
Debt instrument, maturity date   Oct. 17, 2022        
Senior Secured Credit Facilities | Third Amendment | Refinancing Term Loan A            
Debt Instrument [Line Items]            
Line of credit facility   $ 391.0        
Senior Secured Credit Facilities | Third Amendment | Refinancing Term Loan A1 Facility            
Debt Instrument [Line Items]            
Line of credit facility   1,250.0        
Senior Secured Credit Facilities | Third Amendment | Refinancing Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility   $ 500.0        
Senior Secured Credit Facilities | Fourth Amendment            
Debt Instrument [Line Items]            
Cash that can be used to offset indebtedness $ 500.0          
Senior Secured Credit Facilities | Fourth Amendment | Term Loan B3 Facility            
Debt Instrument [Line Items]            
Loan facility principal amount $ 542.3          
Debt instrument, maturity date Apr. 26, 2024          
Senior Secured Credit Facilities | Minimum | Fourth Amendment | Term Loan B3 Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 2.00%          
Senior Secured Credit Facilities | Minimum | Fourth Amendment | Term Loan B3 Facility | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 1.00%          
Senior Secured Credit Facilities | Maximum | Third Amendment            
Debt Instrument [Line Items]            
Consolidated net leverage ratio   400.00%        
Senior Secured Credit Facilities | Maximum | Third Amendment | Fiscal Quarter Ending March 31, 2019            
Debt Instrument [Line Items]            
Consolidated net leverage ratio   375.00%        
Senior Secured Credit Facilities | Maximum | Fourth Amendment | Term Loan B3 Facility | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 2.25%          
Senior Secured Credit Facilities | Maximum | Fourth Amendment | Term Loan B3 Facility | Prime Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 1.25%          
[1] Includes unused commitment fee of 0.30% and letter of credit fee of 1.75% not reflected in interest rate above.