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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 107 Months Ended
--- | --- | --- | --- | ---
Jul. 29, 2016 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchase program, repurchased cost |  |  | $ 30.2 |  | $ 10.1 | $ 52.4 | $ 25.3 |
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 |  |  | 2025-05 |  | 2025-05
O 2024 Q3 Dividends [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Quarterly dividends declared |  | $ 0.308 |  |  |  |  |  |
Dividends payable, date to be paid, year and month |  | 2025-08 |  |  |  |  |  |
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 |  |  | $ 609.8 |  |  | $ 609.8 |  | $ 609.8
Shares repurchase program, shares repurchased |  |  | (206,829) |  | (83,811) | (356,705) | (226,393) |
Common Stock [Member] | Share Repurchase Program Excluding Accelerated Share Repurchase [Member] |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchase program, shares repurchased |  |  | 200,000 |  |  | 400,000 |  |
Shares repurchase program, repurchased cost |  |  | $ 30.0 |  |  | $ 52.0 |  |
Shares repurchase program, average price per share |  |  | $ 145.04 |  |  | $ 145.78 |  |
Common Stock [Member] | Share Repurchase Program Including Accelerated Share Repurchase [Member] |  |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchase program, shares repurchased |  |  |  |  |  |  |  | 15,000,000
Shares repurchase program, repurchased cost |  |  |  |  |  |  |  | $ 1,090.2
Shares repurchase program, average price per share |  |  |  |  |  |  |  | $ 72.67
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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