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Debt and Credit Arrangements Debt Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Debt Instrument [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | $ 0.2 | $ 0.4 | $ 0.6 | $ 0.7
Unsecured Debt 4.65% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500.0 |  | $ 500.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.65% |  | 4.65% |
Maturity Date |  |  | Oct. 01, 2028 |
4.750% Notes Due 2030 (less unamortized discount and issuance costs of $2.8 and $4.1, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 650.0 |  | $ 650.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |  | 4.75% |
Maturity Date |  |  | Mar. 30, 2030 |
Unsecured Debt 2.400% Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.40% |  | 2.40% |
2.400% Notes Due 2031 (less unamortized discount and issuance costs of $0.6 and $3.6, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500.0 |  | $ 500.0 |
Maturity Date |  |  | Mar. 01, 2031 |
3.375% Notes Due 2041 (less unamortized discount and issuance costs of $1.0 and $5.1, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity Date |  |  | Mar. 01, 2041 |
Unsecured Debt 5.40% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500.0 |  | $ 500.0 |
Debt Instrument, Interest Rate, Stated Percentage | 5.40% |  | 5.40% |
Maturity Date |  |  | Oct. 01, 2048 |
Unsecured Debt 3.375% Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 500.0 |  | $ 500.0 |
Debt Instrument, Interest Rate, Stated Percentage | 3.375% |  | 3.375% |
Unsecured Debt 4.200% Notes Remaining Principal |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value | $ 250.0 |  | $ 250.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.20% |  | 4.20% |
Maturity Date |  |  | Apr. 15, 2024 |

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