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Debt (Amended Credit Agreement) (Details)
12 Months Ended
Jun. 12, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2019
USD ($)
Jun. 12, 2019
AUD ($)
Jun. 12, 2019
USD ($)
Feb. 14, 2018
USD ($)
Debt Instrument [Line Items]                  
Loss on extinguishment of debt   $ (4,795,000) $ 0 $ 0          
Long-term debt           $ 2,770,033,000      
Additional increase in borrowing capacity ability           450,000,000.0      
Amended Credit Agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity           100,000,000.0      
Loss on extinguishment of debt $ (1,200,000)                
Debt issuance costs, gross               $ 4,700,000  
Revolver                  
Debt Instrument [Line Items]                  
Revolver           520,700,000      
Additional Revolver                  
Debt Instrument [Line Items]                  
Borrowing capacity remaining           317,000,000.0      
Line of Credit                  
Debt Instrument [Line Items]                  
Term loan     786,000,000     778,000,000      
Revolver     $ 490,843,000     520,671,000      
Long-term debt           $ 1,138,081,000      
Revolving Credit Facility | Line of Credit | Amended Credit Agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               $ 900,000,000.0 $ 900,000,000
Covenant, total leverage ratio, maximum             6.25 6.25  
Senior secured leverage ratio             3.50 3.50  
Interest coverage ratio             3.00 3.00  
Weighted average interest rates on outstanding borrowings         3.80% 3.80%      
Revolving Credit Facility | Line of Credit | Amended Credit Agreement | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate             2.25% 2.25%  
Term Loan                  
Debt Instrument [Line Items]                  
Term loan           $ 778,000,000.0      
Term Loan | Line of Credit | Amended Credit Agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               $ 792,000,000.0  
Term Loan | Line of Credit | Amended Credit Agreement | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate             2.00% 2.00%  
Variable rate, floor             0.75% 0.75%  
Letter of credit                  
Debt Instrument [Line Items]                  
Long-term debt           62,000,000.0      
Letter of credit | Line of Credit | Amended Credit Agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity             $ 275,000,000    
Long-term debt           0      
Letter of credit | Line of Credit | Bank Guarantee And Standby Sub Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         $ 100,000,000 70,100,000      
Accordion | Line of Credit | Amended Credit Agreement                  
Debt Instrument [Line Items]                  
Accordion feature, increase limit $ 450,000,000.0                
Ravenhall | Letter of credit | Revolver                  
Debt Instrument [Line Items]                  
Maximum exposure, undiscounted         $ 58,000,000 $ 40,700,000