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DEBT, CREDIT FACILITIES, AND LEASE OBLIGATIONS - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2018
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2013
Debt Instrument [Line Items]            
Proceeds from issuance of debt     $ 688,000,000 $ 994,700,000 $ 253,500,000  
Weighted-average interest rate under all debt obligations (as a percent)     3.40% 2.20%    
Total expense for all operating leases     $ 27,000,000 $ 27,300,000 $ 22,900,000  
2013 Notes            
Debt Instrument [Line Items]            
Fixed-rate unsecured senior notes           $ 600,000,000.0
Price equal to principal amount, plus accrued and unpaid interest (as a percent) 101.00%          
2013 Notes | Level 2            
Debt Instrument [Line Items]            
Fair value of the notes, based on Level 2 inputs     607,000,000 604,300,000    
Senior Notes            
Debt Instrument [Line Items]            
Unamortized discount     $ 1,300,000 $ 500,000    
Senior Notes | Fixed-rate 4.300% 2018 Notes            
Debt Instrument [Line Items]            
Fixed-rate unsecured senior notes $ 600,000,000          
Proceeds from issuance of debt 598,600,000          
Unamortized discount $ 1,400,000          
Credit Facility | Credit agreement, maturity July 2019            
Debt Instrument [Line Items]            
Term of the credit agreement   5 years        
Credit Agreement Maturity April 2023 | Credit Facility            
Debt Instrument [Line Items]            
Aggregate borrowings in multiple currencies   $ 750,000,000        
Facility fee (as a percent)     0.10%      
Issuance costs     $ 2,400,000      
Borrowings outstanding     $ 0      
Credit Agreement Maturity April 2023 | Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     0.90%      
Credit Agreement Maturity April 2023 | Credit Facility | High            
Debt Instrument [Line Items]            
Additional amount available, subject to lender approval   $ 250,000,000        
Facility fee (as a percent)   0.20%        
Credit Agreement Maturity April 2023 | Credit Facility | High | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)   1.30%        
Credit Agreement Maturity April 2023 | Credit Facility | Low            
Debt Instrument [Line Items]            
Facility fee (as a percent)   0.10%        
Credit Agreement Maturity April 2023 | Credit Facility | Low | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)   0.90%        
Credit agreement, maturity July 2019 | Credit Facility            
Debt Instrument [Line Items]            
Term of the credit agreement   5 years        
Facility fee (as a percent)     0.125%      
Credit agreement, maturity July 2019 | Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     1.00%