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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 110 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 22, 2025 | Jul. 29, 2016 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchase program, repurchased cost |  |  | $ 27.3 |  |  | $ 15.1 | $ 79.7 | $ 40.4 |
O 2025 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Quarterly dividends declared |  |  |  |  | $ 0.308 |  |  |  |
Dividends payable, date to be paid, year and month |  |  |  |  | 2025-03 |  |  |  |
O 2025 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Quarterly dividends declared |  |  |  | $ 0.308 |  |  |  |  |
Dividends payable, date to be paid, year and month |  |  |  | 2025-05 |  |  |  |  |
O 2025 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Quarterly dividends declared |  |  | $ 0.308 |  |  |  |  |  |
Dividends payable, date to be paid, year and month |  |  | 2025-08 |  |  |  | 2025-08 |  | 2025-08
O 2025 Q4 Dividends [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Quarterly dividends declared | $ 0.339 |  |  |  |  |  |  |  |
Dividends payable, date to be paid, year and month | 2025-11 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchase program, expiration date |  | Dec. 31, 2026 |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 582.8 |  |  |  | $ 582.8 |  | $ 582.8
Shares repurchase program, shares repurchased |  |  | (149,230) |  |  | (125,992) | (505,935) | (352,385) |
Common Stock [Member] | Share Repurchase Program Excluding Accelerated Share Repurchase [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchase program, shares repurchased |  |  | 100,000 |  |  |  | 500,000 |  |
Shares repurchase program, repurchased cost |  |  | $ 27.0 |  |  |  | $ 79.0 |  |
Shares repurchase program, average price per share |  |  | $ 181.19 |  |  |  | $ 156.22 |  |
Common Stock [Member] | Share Repurchase Program Including Accelerated Share Repurchase [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchase program, shares repurchased |  |  |  |  |  |  |  |  | 15,100,000
Shares repurchase program, repurchased cost |  |  |  |  |  |  |  |  | $ 1,117.2
Shares repurchase program, average price per share |  |  |  |  |  |  |  |  | $ 73.74
Common Stock [Member] | July 2018 Program [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchase program, authorized amount |  | $ 150.0 |  |  |  |  |  |  |
Common Stock [Member] | December 2026 Program [Member] |  |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchase program, authorized amount |  | $ 1,700.0 |  |  |  |  |  |  |

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