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Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of New Debt Issuance [Line Items] |  |  |
Recognition of previously unrealized gains included in net income | $ 3.8 | $ 2.6 | $ 1.4
4.20% Notes Due 2024 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 250.0 |  |
Interest rate, stated percentage | 4.20% |  |
4.65% Notes Due 2028 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |
Interest rate, stated percentage | 4.65% |  |
4.75% Note Due 2030 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 650.0 |  |
Interest rate, stated percentage | 4.75% |  |
5.40% Notes Due 2048 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |
Interest rate, stated percentage | 5.40% |  |
2.400% Note Due 2031 (less unamortized discount and issuance costs of $0.7 and $4.3, respectively) |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |
Interest rate, stated percentage | 2.40% |  |
3.375% Note Due 2041 (less unamortized discount and issuance costs of $1.1 and $5.5, respectively) |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |
Interest rate, stated percentage | 3.375% |  |
Unsecured Debt 5.375% Notes |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 300.0 |  |
Interest rate, stated percentage | 5.375% |  |

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