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Debt (Schedule Of Short-Term And Long-Term Debt) (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Sep. 30, 2013 | Sep. 30, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  | $ 2,677.7 | $ 3,425.4
Forward starting interest rate swap agreement fixed rate | 3.11% | 4.73% |  |
Short-term Debt |  |  | 749.7 | 0.0
$750.0 Million Fixed Rate Notes Due March 2025, stated rate of 3.00% [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  | 0.0 | 749.1
Debt Instrument, Face Amount |  |  | $ 750.0 |
Debt Instrument, Maturity Date |  |  | Mar. 15, 2025 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.00% |
$500.0 Million Fixed Rate Notes Due June 2028, stated rate of 3.75% [Member] [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  | $ 498.4 | 498.1
Debt Instrument, Face Amount |  |  | $ 500.0 |
Debt Instrument, Maturity Date |  |  | Jun. 15, 2028 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.75% |
$750.0 million Fixed Rate Notes Due September 2043, stated rate of 5.30% [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  | $ 744.2 | 744.0
Debt Instrument, Face Amount |  |  | $ 750.0 |
Debt Instrument, Maturity Date |  |  | Sep. 15, 2043 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.30% |
$700.0 Million Fixed Rate Notes Due June 2048, stated rate of 4.15% [Member] [Domain] [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  | $ 691.6 | 691.3
Debt Instrument, Face Amount |  |  | $ 700.0 |
Debt Instrument, Maturity Date |  |  | Jun. 15, 2048 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.15% |
$750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  | $ 743.5 | $ 742.9
Debt Instrument, Face Amount |  |  | $ 750.0 |
Debt Instrument, Maturity Date |  |  | Mar. 15, 2032 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.65% |

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