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LONG-TERM DEBT AND LINES OF CREDIT - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended 26 Months Ended 50 Months Ended 62 Months Ended 68 Months Ended 71 Months Ended
Jun. 30, 2018
USD ($)
Rate
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
Rate
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
Jun. 30, 2021
Jun. 30, 2022
Dec. 31, 2022
Mar. 31, 2023
Jun. 30, 2020
Sep. 30, 2018
Mar. 20, 2018
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                            
Face amount $ 83,239,000   $ 83,239,000   $ 108,979,000                  
Decrease in interest rate (as a percent)     0.25%                      
Net repayments of settlement lines of credit     $ 88,325,000 $ 88,490,000                    
Other restrictions on payments of dividends (USD per share) | $ / shares     $ 0.01                      
Interest expense $ 48,100,000 $ 47,400,000 $ 93,500,000 $ 88,500,000                    
Secured Debt | Term Loan B-3                            
Debt Instrument [Line Items]                            
Face amount                         $ 1,140,000,000.00  
Credit facility interest rate (as a percent) | Rate 3.84%   3.84%                      
Secured Debt | Term Loan A                            
Debt Instrument [Line Items]                            
Face amount $ 1,500,000,000.0   $ 1,500,000,000.0                      
Credit facility interest rate (as a percent) | Rate 3.59%   3.59%                      
Secured Debt | Term Loan A-2                            
Debt Instrument [Line Items]                            
Face amount $ 1,370,000,000.00   $ 1,370,000,000.00                      
Credit facility interest rate (as a percent) | Rate 3.48%   3.48%                      
Secured Debt | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Face amount $ 1,500,000,000.0   $ 1,500,000,000.0                      
Maximum borrowing capacity 5,500,000,000   5,500,000,000                      
Line of credit                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity 667,900,000.0   667,900,000.0                      
Remaining borrowing capacity 764,200,000   764,200,000                      
Net repayments of settlement lines of credit     48,200,000   59,300,000                  
Amount outstanding under lines of credit $ 547,300,000   $ 547,300,000   $ 635,200,000                  
Weighted-average interest rate of short-term debt (as a percent) 2.45%   2.45%   1.97%                  
Average outstanding balance $ 396,400,000                          
Interest rate swap                            
Debt Instrument [Line Items]                            
Accumulated other comprehensive income (loss) related to interest rate $ 9,700,000   $ 9,700,000                      
Revolving Credit Facility | Fourth Amendment                            
Debt Instrument [Line Items]                            
Minimum interest coverage ratio 3.25   3.25                      
Revolving Credit Facility | Secured Debt                            
Debt Instrument [Line Items]                            
Effective interest rate (as a percent) | Rate 3.48%   3.48%                      
Revolving Credit Facility | Forecast | Term Loan B-3                            
Debt Instrument [Line Items]                            
Rate of quarterly installment payments (as a percent)                   0.25%        
Revolving Credit Facility | Forecast | Term Loan A                            
Debt Instrument [Line Items]                            
Rate of quarterly installment payments (as a percent)           0.625% 1.25% 1.875% 2.50%          
Revolving Credit Facility | Forecast | Fourth Amendment                            
Debt Instrument [Line Items]                            
Maximum leverage ratio           4.75         4.50 5.00    
Letter of Credit | Line of credit                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity $ 100,000,000   $ 100,000,000                      
Standby letters of credit | Line of credit                            
Debt Instrument [Line Items]                            
Remaining borrowing capacity $ 1,125,400,000   $ 1,125,400,000                     $ 473,300,000
Minimum | Revolving Credit Facility | Fourth Amendment                            
Debt Instrument [Line Items]                            
Commitment fee rate (as a percent)     0.20%                      
Maximum | Revolving Credit Facility | Fourth Amendment                            
Debt Instrument [Line Items]                            
Commitment fee rate (as a percent)     0.30%