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Share-based Payments, PSU's (Details 4) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Shares (in millions) |  |  |
Granted (in shares) | 1,206,263 | 540,915 | 717,952
Weighted Average Grant Date Fair Value |  |  |
Share-based compensation expense, net of forfeitures, in the fiscal year | $ 37.8 | $ 61.1 | $ 63.5
The tax benefit related to share-based compensation expense in the fiscal year | 9.0 | 7.5 | 6.5
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized | $ 17.0 |  |
The average weighted-average period the unrecognized compensation cost will be recognized (years) | 1 year |  |
The total fair value of options vested during the fiscal year | $ 0.0 | 0.0 | 0.0
Proceeds from Stock Options Exercised | 0.0 | 16.0 | 0.0
Tax benefit for tax deductions from options during the fiscal year | $ 7.9 | $ 13.4 | $ 14.0
TSR Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Minimum retirement age for performance units to vest | 60 years |  |
Number Of Trading Days To Calculate Weighted Average Trading Price | 30 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Expected volatility (percent) | 48.33% | 54.77% | 58.26%
Expected dividend yield (percent) | 1.52% | 0.81% | 0.68%
Expected term (in years) | 3 years | 3 years | 3 years
Risk-free interest rate (percent) | 4.52% | 1.68% | 0.32%
Shares (in millions) |  |  |
Granted (in shares) | 1,206,283 | 540,915 | 717,952
Weighted Average Grant Date Fair Value |  |  |
Weighted Average Grant Date Fair Value Per Share, Granted (in usd per share) | $ 50.56 | $ 55.08 | $ 27.91
Performance Units Cash Settled |  |  |
Shares (in millions) |  |  |
Number of stock units outstanding at beginning of period (shares) | 791,624 |  |
Granted (in shares) | 354,500 | 195,755 | 262,308
Number of stock units outstanding at end of period (shares) | 500,393 | 791,624 |
Performance Units |  |  |
Shares (in millions) |  |  |
Number of stock units outstanding at beginning of period (shares) | 2,600,000 |  |
Granted (in shares) | 1,200,000 |  |
Issued and canceled (shares) | (2,500,000) |  |
Number of stock units outstanding at end of period (shares) | 1,300,000 | 2,600,000 |
Weighted Average Grant Date Fair Value |  |  |
Weighted-average grant date fair value per share - stock unit awards outstanding, beginning of period (in usd per share) | $ 21.89 |  |
Weighted Average Grant Date Fair Value Per Share, Granted (in usd per share) | 50.56 |  |
Issued and canceled (in usd per share) | 13.30 |  |
Weighted-average grant date fair value per share - stock unit awards outstanding, end of period (in usd per share) | $ 39.86 | $ 21.89 |

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