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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Schedule of Common Stock Activity
The following table summarizes Common Stock activity during the periods presented below:
Year Ended December 31,
202320222021
(In millions)
Shares outstanding at the beginning of the period143.9 133.3 97.8 
Shares issued for vested restricted stock units1.5 0.7 1.0 
Shares issued in exchange for debt retirement— — 10.0 
Shares issued under at-the-market equity offering program— 10.1 24.8 
Shares repurchased(16.7)(0.2)(0.3)
Shares outstanding at the end of the period128.7 143.9 133.3