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Employee Benefit Plans - RSU, RSA, and PSA Activities (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Oct. 27, 2020
Jul. 28, 2020
Apr. 28, 2020
Jan. 27, 2020
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Grant-Date Fair Value per Share                                      
Payments of cash dividends (in dollars per share) $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.80 $ 0.76 $ 0.72
Restricted Stock Units (RSU) and Restricted Stock | Minimum                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Award vesting period                                 3 years    
Performance Shares (PSAs)                                      
Number of Shares                                      
Granted (in shares)                                 0.9    
Performance Shares (PSAs) | Minimum                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Award vesting period                                 2 years    
Performance Shares (PSAs) | Maximum                                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Award vesting period                                 3 years    
RSUs, RSAs, and PSAs                                      
Number of Shares                                      
Balance at beginning of period (in shares)               17.5                 17.5    
Granted (in shares)                                 8.4    
Awards assumed upon acquisition of 128 Technology (in shares)                                 3.1    
Vested (in shares)                                 (6.7)    
Canceled (in shares)                                 (2.4)    
Balance at end of period (in shares)         19.9       17.5               19.9 17.5  
Weighted Average Grant-Date Fair Value per Share                                      
Balance at beginning of period (in dollars per share)               $ 25.30                 $ 25.30    
Granted (in dollars per share)                                 22.13    
Awards assumed upon acquisition of 128 Technology (in dollars per share)                                 20.15    
Vested (in dollars per share)                                 25.92    
Canceled (in dollars per share)                                 24.38    
Balance at end of period (in dollars per share)         $ 23.05       $ 25.30               $ 23.05 $ 25.30  
Weighted Average Remaining Contractual Term (In Years)                                 1 year 3 months 18 days  
Aggregate Intrinsic Value         $ 447.7                     $ 447.7  
Vested and expected-to-vest RSUs and PSAs, number of shares at (in shares)         18.6                       18.6    
Vested and expected-to-vest RSUs and PSA, grant date fair value (in dollars per share)                                 $ 23.04    
Options vested and expected to vest, weighted average remaining contractual term                                 1 year 3 months 18 days    
Vested and expected-to-vest RSUs and PSA, aggregate intrinsic value                                 $ 419.1    
Weighted-average grant-date fair value, RSUs, RSAs, PSUs granted, assumed or substituted (in usd per share)                                 $ 21.59 $ 25.26 $ 25.33
Fair value of RSUs, RSAs and PSAs                                 $ 174.7 $ 170.0 $ 200.5
Service-based RSUs                                      
Number of Shares                                      
Granted (in shares)                                 7.1    
Marked-based RSUs                                      
Number of Shares                                      
Granted (in shares)                                 0.4