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Debt - Additional Information (Detail)
$ in Millions, $ in Millions
12 Months Ended
Feb. 19, 2020
Mar. 26, 2019
May 30, 2018
USD ($)
Apr. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Dec. 31, 2020
CAD ($)
Apr. 02, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Oct. 01, 2013
USD ($)
Debt Instrument [Line Items]                        
Loss on debt extinguishment           $ (25.7)            
Capitalization of financing costs         $ 3.6              
Write off of unamortized deferred financing costs         $ 0.5              
Debt instrument, covenant description         The Senior Secured Credit Facility documents contain a requirement that we maintain a ratio of adjusted first lien debt to Credit Facility EBITDA below specified levels on a quarterly basis; however, such requirement is applicable only if more than 35% of the Revolving Credit Facility is drawn. On April 2, 2020, in light of the uncertainty and volatility in the global financial markets resulting from the COVID-19 pandemic, we elected to borrow $295.0 million under the 2018 Revolving Credit Facility as a precautionary measure to increase our cash position and to preserve financial flexibility. In December 2020, we repaid the amount drawn on the revolving credit facility and as of December 31, 2020, no portion of the Revolving Credit Facility was drawn.              
Fair value of our indebtedness         $ 657.6         $ 675.1    
Canada [Member]                        
Debt Instrument [Line Items]                        
Issuance of letters of credit               $ 7.0     $ 7.0  
Letters of credit outstanding         5.4     $ 7.0   5.4 $ 7.0  
Revolving Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Available capacity for letters of credit       $ 300.0 $ 300.0         300.0    
Line of credit facility, borrow amount elected by the company                 $ 295.0      
Senior Secured Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Loss on debt extinguishment       (7.1)                
Interest rate description         Term Debt interest rate was reduced from LIBOR plus 3.25% to LIBOR plus 3.00%, so long as the rating is maintained. On February 19, 2020, we completed the first amendment to the Senior Secured Credit Facility in which the interest rate was reduced from LIBOR plus 3.00% to LIBOR plus 2.5%.              
Accrued interest         $ 0.1         $ 0.1    
Senior Secured Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, variable interest rate 2.50% 3.00%         3.25%          
Term Debt [Member]                        
Debt Instrument [Line Items]                        
Debt instrument principal amount       $ 680.0                
Debt instrument interest rate stated percentage         2.60%     2.60%   4.80% 4.80%  
Term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, variable interest rate         3.25%              
Senior Secured Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Term debt, unamortized deferred financing cost         $ 5.7         $ 6.8    
Senior note, amortized interest rate           5.30%            
Senior Notes [Member]                        
Debt Instrument [Line Items]                        
Debt instrument principal amount                       $ 475.0
Loss on debt extinguishment           $ (18.6)            
Write off of unamortized deferred financing costs     $ 5.5