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Employee Benefit Plans - Restricted Sotck Unit and Performance Share Award Activities (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jan. 29, 2019
Mar. 31, 2019
Mar. 31, 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 $ 0.18
RSUs, RSAs, and PSAs      
Number of Shares      
Balance at beginning of period (in shares)   17.4  
Balance at end of period (in shares)   17.7  
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)   $ 25.21  
Weighted average remaining contractual term   1 year 6 months  
Aggregate intrinsic value   $ 467.8  
Restricted Stock Units (RSUs)      
Number of Shares      
Granted (in shares)   5.5  
Vested (in shares)   (3.9)  
Canceled (in shares)   (0.8)  
Weighted Average Grant-Date Fair Value per Share      
Granted (in dollars per share)   $ 25.53  
Vested (in dollars per share)   26.00  
Canceled (in dollars per share)   $ 26.32  
Performance goal, number of shares (in shares)   0.2  
Restricted Stock Awards (RSAs)      
Number of Shares      
Vested (in shares)   (0.1)  
Weighted Average Grant-Date Fair Value per Share      
Vested (in dollars per share)   $ 23.13  
Performance shares (PSAs)      
Number of Shares      
Granted (in shares)   0.7  
Vested (in shares)   (0.5)  
Canceled (in shares)   (0.6)  
Weighted Average Grant-Date Fair Value per Share      
Granted (in dollars per share)   $ 25.06  
Vested (in dollars per share)   26.76  
Canceled (in dollars per share)   $ 23.25  
Performance goal, number of shares (in shares)   0.4  
Number of shares modified   0.3  
Incremental compensation cost resulting from the modifications   $ 7.7  
Minimum | Restricted Stock Units (RSUs)      
Weighted Average Grant-Date Fair Value per Share      
Performance goal, number of shares (in shares)   0.0  
Minimum | Performance shares (PSAs)      
Weighted Average Grant-Date Fair Value per Share      
Performance goal, number of shares (in shares)   0.0  
Maximum | Restricted Stock Units (RSUs)      
Weighted Average Grant-Date Fair Value per Share      
Performance goal, number of shares (in shares)   0.4  
Maximum | Performance shares (PSAs)      
Weighted Average Grant-Date Fair Value per Share      
Performance goal, number of shares (in shares)   0.7