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Equity Incentive Program (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Share-Based Compensation, Employee Stock Purchase Plan, Activity | The following table summarizes the stock-based compensation expense recognized by the Company for the periods presented:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Total pre-tax stock-based compensation expense | $ | 7.4 |  |  | $ | 7.1 |  |  | $ | 14.1 |  |  | $ | 14.9 |
Tax benefit | 0.3 |  |  | 0.3 |  |  | 3.0 |  |  | 3.2 |
Total stock-based compensation expense, net of tax | $ | 7.1 |  |  | $ | 6.8 |  |  | $ | 11.1 |  |  | $ | 11.7 |
Schedule of Black-Scholes Option-Pricing Assumptions | No stock options were granted during the six months ended June 30, 2024 and 2023.
Schedule of SSAR and Stock Options Activity | The following table summarizes the Company's stock option activity for the six months ended June 30, 2024:
|  |  |  |  |  |  |  |  | Number of Shares |  | Weighted-Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted-Average Remaining Contractual Term (Years)
(in millions, except share and per share amounts)
Outstanding at December 31, 2023 |  |  |  |  |  |  |  |  | 2,104,356 |  |  | $ | 17.15 |  |  |  |  |
Exercised |  |  |  |  |  |  |  |  | (10,325) |  |  | 15.10 |  |  |  |  |
Expired |  |  |  |  |  |  |  |  | (331,709) |  |  | 19.27 |  |  |  |  |
Outstanding at June 30, 2024 |  |  |  |  |  |  |  |  | 1,762,322 |  |  | $ | 16.77 |  |  | $ | 2.1 |  |  | 2.1
Exercisable at June 30, 2024 |  |  |  |  |  |  |  |  | 1,705,929 |  |  | $ | 16.62 |  |  | $ | 2.1 |  |  | 2.0
Schedule of Restricted Stock Units Award Activity | The following table summarizes the Company's restricted stock unit ("RSU") activity for the six months ended June 30, 2024:
| Share units |  | Weighted-average grant date fair value
Unvested at December 31, 2023 | 2,075,007 |  |  | $ | 19.49 |
Granted | 1,496,407 |  |  | 16.71 |
Vested (1) | (920,876) |  |  | 19.73 |
Forfeited | (108,071) |  |  | 18.13 |
Unvested at June 30, 2024 | 2,542,467 |  |  | $ | 17.83 |
(1) The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.
Share-based Payment Arrangement, Performance Shares, Outstanding Activity | The following table summarizes the Company's PSU activity for the six months ended June 30, 2024:
| Share units |  | Weighted-average grant date fair value
Unvested at December 31, 2023 | 864,749 |  |  | $ | 29.28 |
Granted | 414,680 |  |  | 24.09 |
Vested (1) | (258,680) |  |  | 28.49 |
Forfeited | (69,360) |  |  | 27.60 |
Unvested at June 30, 2024 | 951,389 |  |  | $ | 27.35 |
(1) The number of PSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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