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Employee Benefit Plans - Restricted Stock Unit and Performance Share Award Activities (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jul. 25, 2019
Apr. 25, 2019
Jan. 29, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Weighted Average Grant-Date Fair Value per Share              
Cash dividends declared per share of common stock (in dollars per share) $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.18 $ 0.57 $ 0.54
RSUs, RSAs, and PSAs              
Number of Shares              
Balance at beginning of period (in shares)           17.4  
Balance at end of period (in shares)       18.8   18.8  
Weighted Average Grant-Date Fair Value per Share              
Balance at beginning of period (in dollars per share)           $ 25.32  
Balance at end of period (in dollars per share)       $ 25.20   $ 25.20  
Weighted average remaining contractual term           1 year 2 months 12 days  
Aggregate intrinsic value       $ 465.9   $ 465.9  
Restricted Stock Units (RSUs)              
Number of Shares              
Granted (in shares)           7.3  
Assumed upon the acquisition of Mist (in shares)           0.1  
Vested (in shares)           (4.7)  
Canceled (in shares)           (2.0)  
Weighted Average Grant-Date Fair Value per Share              
Granted (in dollars per share)           $ 25.36  
Assumed upon the acquisition of Mist (in dollars per share)           25.81  
Vested (in dollars per share)           25.93  
Canceled (in dollars per share)           $ 26.03  
Performance goal, number of shares (in shares)       0.2   0.2  
Restricted Stock Awards (RSAs)              
Number of Shares              
Assumed upon the acquisition of Mist (in shares)           0.7  
Vested (in shares)           (0.1)  
Weighted Average Grant-Date Fair Value per Share              
Assumed upon the acquisition of Mist (in dollars per share)           $ 27.20  
Vested (in dollars per share)           $ 23.10  
Performance shares (PSAs)              
Number of Shares              
Granted (in shares)           1.5  
Vested (in shares)           (0.5)  
Canceled (in shares)           (0.9)  
Weighted Average Grant-Date Fair Value per Share              
Granted (in dollars per share)           $ 25.06  
Vested (in dollars per share)           26.77  
Canceled (in dollars per share)           $ 23.64  
Performance goal, number of shares (in shares)       0.4   0.4  
Number of shares modified           1.5  
Incremental compensation cost resulting from the modifications           $ 30.2  
Minimum | Restricted Stock Units (RSUs)              
Weighted Average Grant-Date Fair Value per Share              
Performance goal, number of shares (in shares)       0.0   0.0  
Minimum | Performance shares (PSAs)              
Weighted Average Grant-Date Fair Value per Share              
Performance goal, number of shares (in shares)       0.0   0.0  
Maximum | Restricted Stock Units (RSUs)              
Weighted Average Grant-Date Fair Value per Share              
Performance goal, number of shares (in shares)       0.4   0.4  
Maximum | Performance shares (PSAs)              
Weighted Average Grant-Date Fair Value per Share              
Performance goal, number of shares (in shares)       0.7   0.7