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Employee Benefit Plans Summary of All Employee Restricted Equity Award Activity (Detail) - Employee Restricted Equity Awards - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Beginning of year 4,856,356 5,858,848 6,951,373
Add (deduct):      
Granted 1,835,145 1,876,109 2,383,475
Vested (2,691,337) (2,811,070) (3,220,671)
Forfeited (121,087) (67,531) (255,329)
End of year 3,879,077 4,856,356 5,858,848
Weighted Average Grant Date Fair Value      
Beginning of year $ 38.56 $ 30.47 $ 26.18
Granted 49.61 45.55 32.01
Vested 31.85 26.41 22.53
Forfeited 43.98 36.10 28.03
End of year $ 48.28 $ 38.56 $ 30.47
Unrecognized compensation cost related to unvested equity awards $ 95.9    
Period of recognition of compensation expense related to unvested equity awards 2 years 3 months 18 days    
Dividend Equivalent Units      
Add (deduct):      
Granted 210,159 144,668 157,396
Weighted Average Grant Date Fair Value      
Granted $ 0 $ 0 $ 0
Performance Shares      
Weighted Average Grant Date Fair Value      
Target shares 726,712    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Number 1,740,712