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Debt and Credit Facilities - Amended and Restated Senior Secured Credit Facilities (Details)
£ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jul. 12, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Aug. 01, 2019
USD ($)
Jul. 12, 2018
GBP (£)
Jul. 11, 2018
USD ($)
Interest Expense            
Debt Instrument [Line Items]            
Amortization expense   $ 0.5 $ 1.4      
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Revolving credit facilities           $ 700.0
Term Loan A due July 2023            
Debt Instrument [Line Items]            
Term loans $ 186.5       £ 29.4  
Revolving credit facilities       $ 475.0    
Lender and third party fees       $ 0.4    
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Revolving credit facilities 1,000.0          
Loss on debt redemption 1.9          
Accelerated amortization of original issuance discount 1.5          
Included in debt redemption was non-lender fees incurred 0.4          
Debt issuance lender fees $ 0.7          
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Other Assets            
Debt Instrument [Line Items]            
Debt issuance costs capitalized   $ 4.9 $ 4.9      
Base Rate | Third Amended And Restated Credit Agreement | Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.25%          
Base Rate | Third Amended And Restated Credit Agreement | Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.00%