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Stockholders' Equity Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Nonvested stock rollforward Activity under the Company’s RSU awards for the years ended December 31, 2022, 2021, and 2020 was as follows:
(Shares in thousands, $ in millions)202220212020
 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 year1,409 $25.6 929 $17.9 756 $19.6 
Granted831 14.8 1,033 17.5 647 10.1 
Vested(634)(12.3)(505)(8.9)(450)(11.2)
Forfeited(127)(2.1)(48)(0.9)(24)(0.6)
Nonvested, end of year1,479 $26.0 1,409 $25.6 929 $17.9 
Disclosure of Fair Value of PSU Awards
The fair value of each PSU award, the target share units awarded and projected future compensation expense to be recognized for these awards, including actual and estimated forfeitures at December 31, 2022 was as follows:
(Shares in thousands, $ in millions)
PSU Award Performance PeriodAward Fair ValueDecember 31, 2022 Unrecognized Compensation ExpenseCompensation Expense Expected to be Recognized in the next 12 monthsTarget Share Units
2020-2022$13.5 $— $— 674 
2021-2023$9.3 3.1 3.1 459 
2022-2024$11.0 8.9 3.9 494 
2022-2025 BPA$18.5 12.1 3.3 811 
     Total$24.1 $10.3