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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Basic to Diluted Net Income Per Share | The following table reconciles the shares used in the calculation of basic net income per share to those used for diluted net income per share:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
($ in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Net income | $ | 140.0 |  |  | $ | 136.0 |  |  | $ | 361.6 |  |  | $ | 362.6 |
Weighted average common shares outstanding | 72.2 |  |  | 72.8 |  |  | 72.3 |  |  | 73.1 |
Dilutive effect of equity awards, based on the treasury stock method | 0.4 |  |  | 0.6 |  |  | 0.4 |  |  | 0.7 |
Weighted average shares assuming dilution | 72.6 |  |  | 73.4 |  |  | 72.7 |  |  | 73.8 |
Schedule of Repurchase of Common Stock | The below table summarizes the details of the Company's repurchases of common stock under these programs:
|  |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  |  | 2024 |  | 2025 |  | 2024
Shares repurchased |  |  | 170,771 |  |  | 552,593 |  |  | 1,409,786 |
Total cost of repurchases ($ in millions) |  |  | $ | 52.4 |  |  | $ | 134.0 |  |  | $ | 506.5 |
Average price per repurchased share |  |  | $ | 306.34 |  |  | $ | 242.55 |  |  | $ | 359.24 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
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