Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) - USD ($) $ in Millions |
Mar. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Short-term borrowings and current maturities of long-term debt | $ 902.1 | $ 801.9 |
| Long-term debt excluding current maturities | 3,978.7 | 3,977.9 |
| Debentures With Put Feature [Member] | ||
| Short-term borrowings and current maturities of long-term debt | 295.0 | 295.0 |
| Commercial Paper [Member] | ||
| Short-term borrowings and current maturities of long-term debt | 100.0 | 0.0 |
| Current Maturities Of Long Term Debt [Member] | ||
| Short-term borrowings and current maturities of long-term debt | 7.5 | 7.5 |
| Three Point Five Five Percent Senior Notes due 2024 [Member] | ||
| Short-term borrowings and current maturities of long-term debt | $ 499.6 | $ 499.4 |
| Debt Instrument, Interest Rate, Stated Percentage | 3.55% | 3.55% |