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Changes in Capital Structure - Schedule of Repurchases Under Share Repurchase Programs (Details) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Oct. 31, 2019
Sep. 30, 2019
Apr. 30, 2019
Feb. 28, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Aug. 31, 2019
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares)             33,235,480  
Stock repurchase program, authorized amount       $ 400,000,000        
Subsequent Event                
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares) 441,112              
2018 Plan                
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares)       6,153,415        
Average price paid per share (in usd per share)       $ 40,610,000        
Amounts paid for shares purchased       $ 250,000,000        
Capital Allocation Plan, Accelerated Repurchase Agreement February 2019                
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares)     9,438,671   16,615,479 26,054,150    
Average price paid per share (in usd per share)           $ 38,380,000    
Amounts paid for shares purchased     $ 400,000,000   $ 600,000,000 $ 1,000,000,000    
Capital Allocation Plan August 2019                
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares)   1,027,915            
Average price paid per share (in usd per share)   $ 36,990,000            
Amounts paid for shares purchased   $ 38,000,000            
Stock repurchase program, authorized amount               $ 250,000,000
Capital Allocation Plan August 2019 | Subsequent Event                
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares) 441,112              
Average price paid per share (in usd per share) $ 39,100,000              
Amounts paid for shares purchased $ 17,000,000              
Capital Allocation Plan                
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares)             33,235,480  
Amounts paid for shares purchased             $ 1,288,000,000  
Capital Allocation Plan | Subsequent Event                
Schedule of Capitalization, Equity [Line Items]                
Total number of shares purchased (in shares) 33,676,592              
Amounts paid for shares purchased $ 1,305,000,000