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Stockholders' Equity Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Nonvested stock rollforward Activity under the Company’s nonvested stock awards and restricted share units for the years ended December 31, 2020, 2019, and 2018 was as follows:
(Shares in thousands, $ in millions)202020192018
 Number of
shares/units		Weighted
Average
Grant Date
Fair Value		Number of
shares/units		Weighted
Average Grant
Date Fair
Value		Number of
shares		Weighted
Average Grant
Date Fair
Value
Nonvested, beginning of year756 $19.6 1,055 $23.7 1,320 $27.9 
Granted647 10.1 396 10.8 290 7.8 
Vested(450)(11.2)(681)(14.5)(540)(11.7)
Forfeited(24)(0.6)(14)(0.4)(15)(0.3)
Nonvested, end of year929 $17.9 756 $19.6 1,055 $23.7