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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Expense | $ 95.1 | $ 74.9 | $ 75.3
Other Stock Compensation Programs [Abstract] |  |  |
Amortization of Other Deferred Charges (Reversal) |  | $ 13.5 |
Performance Shares [Member] |  |  |
Restricted stock unit activity [Roll Forward] |  |  |
Unvested at beginning of period (in shares) | 458,100 | 567,000.0 | 646,000.0
Granted (in shares) | 168,700 | 185,200 | 116,500
Vested (in shares) | (109,000.0) | (257,200) | (175,100)
Forfeited (in shares) | (92,100) | (36,900) | (20,400)
Unvested at end of period (in shares) | 425,700 | 458,100 | 567,000.0
Share-based Payment Arrangement [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant (in shares) | 1,500,000 |  |
Restricted stock unit activity [Roll Forward] |  |  |
Unvested at beginning of period (in shares) | 1,448,200 | 1,408,300 | 1,558,400
Granted (in shares) | 669,600 | 705,700 | 469,700
Vested (in shares) | (456,500) | (554,000.0) | (570,800)
Forfeited (in shares) | (144,900) | (111,800) | (49,000.0)
Unvested at end of period (in shares) | 1,516,400 | 1,448,200 | 1,408,300
Restricted stock unit activity, additional disclosures [Abstract] |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 175.07 | $ 170.78 | $ 152.27
Weighted average grant date fair value, granted (in dollars per share) | 210.34 | 143.64 | 204.05
Weighted average grant date fair value, vested (in dollars per share) | 184.86 | 126.28 | 147.78
Weighted average grant date fair value, forfeitures (in dollars per share) | 173.88 | 164.42 | 168.92
Weighted average grant date fair value, end of period (in dollars per share) | $ 187.78 | $ 175.07 | $ 170.78
Weighted average remaining contractual life, unvested shares outstanding and expected to vest | 1 year 3 months 18 days |  |
Unamortized deferred compensation cost | $ 93.5 |  |
Fair value of shares vested | 84.4 | $ 70.0 | $ 84.3
Grant date fair value | 140.8 | 101.4 | 95.8
Share-based Payment Arrangement [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Expense | 12.6 | 9.0 | 26.8
Share-based Payment Arrangement [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Payment Arrangement, Expense | $ 82.5 | $ 65.9 | $ 48.5
Restricted Stock Units (RSUs) [Member] |  |  |
Restricted stock unit activity [Roll Forward] |  |  |
Unvested at beginning of period (in shares) | 990,100 | 841,300 | 912,400
Granted (in shares) | 500,900 | 520,500 | 353,200
Vested (in shares) | (347,500) | (296,800) | (395,700)
Forfeited (in shares) | (52,800) | (74,900) | (28,600)
Unvested at end of period (in shares) | 1,090,700 | 990,100 | 841,300

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