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Debt - Narrative (Details) - USD ($)
9 Months Ended
Oct. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Aggregate principal amount   $ 1,950,550,000   $ 1,665,000,000
Proceeds of revolving credit facility   0 $ 5,000,000  
Term Loan - DRG Acquisition | Subsequent Event        
Debt Instrument [Line Items]        
Aggregate principal amount $ 360,000,000      
Bridge Facility - DRG Acquisition        
Debt Instrument [Line Items]        
Aggregate principal amount 1,500,000,000      
Bridge Facility - DRG Acquisition | Subsequent Event        
Debt Instrument [Line Items]        
Borrowing capacity 950,000,000      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Repayments of lines of credit   $ 65,000,000    
Commitment fee   0.50%    
Collateralized amount   $ 4,958,000    
Revolving Credit Facility | Subsequent Event        
Debt Instrument [Line Items]        
Proceeds of revolving credit facility 60,000,000      
Remaining borrowing capacity $ 187,663,000      
Letter of credit        
Debt Instrument [Line Items]        
Collateralized amount   37,000    
Level 2        
Debt Instrument [Line Items]        
Long-term debt, fair value   $ 1,924,197,000   $ 1,692,750,000