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Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of New Debt Issuance [Line Items] |  |  |
Loss on Extinguishment of Debt | $ 0.0 | $ 74.0 | $ 0.0
Recognition of previously unrealized losses included in net income | 1.4 | $ (4.2) | $ (2.4)
Debt Instrument, Fair Value Disclosure | 36.1 |  |
4.00% Notes Due 2022 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 250.0 |  |
3.75% Notes Due 2023 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 500.0 |  |
4.20% Notes Due 2024 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 250.0 |  |
Debt instrument, unamortized discount | 0.0 |  |
4.65% Notes Due 2028 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 500.0 |  |
Debt instrument, unamortized discount | 1.0 |  |
4.75% Note Due 2030 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 650.0 |  |
Debt instrument, unamortized discount | 2.9 |  |
5.40% Notes Due 2048 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 500.0 |  |
Debt instrument, unamortized discount | 2.6 |  |
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 |  |
Debt instrument, unamortized discount | 0.7 |  |
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 |  |
Debt instrument, unamortized discount | 1.0 |  |
Unsecured Debt 4.200% Notes Original Principal |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |

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