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Debt (Schedule Of Short-Term And Long-Term Debt) (Details) € in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2022 EUR (€) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 3,437.1 | $ 2,695.7
Forward starting interest rate swap agreement fixed rate | 3.11% | 4.73% | 3.32% |  |  |
Short-term Debt |  |  |  |  | 0.0 | 749.4
$750.0 million Fixed Rate Notes Due September 2022, stated rate of 3.00% [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 750.0 |
Debt Instrument, Maturity Date |  |  |  | Sep. 15, 2022 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.00% | 3.00% |
Short-term Debt |  |  |  |  | $ 0.0 | 749.4
€15.0 million fixed rate notes due May 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 16.6 | 16.8
Debt Instrument, Face Amount | € |  |  |  | € 15.0 |  |
Debt Instrument, Maturity Date |  |  |  | May 01, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.30% | 4.30% |
$750.0 Million Fixed Rate Notes Due March 2025, stated rate of 3.00% [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 747.9 | 747.7
Debt Instrument, Face Amount |  |  |  |  | $ 750.0 |
Debt Instrument, Maturity Date |  |  |  | Mar. 15, 2025 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.00% | 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 |  |  |  |  | $ 497.3 | 497.2
Debt Instrument, Face Amount |  |  |  |  | $ 500.0 |
Debt Instrument, Maturity Date |  |  |  | Jun. 15, 2028 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.75% | 3.75% |
$750.0 million Fixed Rate Notes Due September 2043, stated rate of 5.30% [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 743.4 | 743.4
Debt Instrument, Face Amount |  |  |  |  | $ 750.0 |
Debt Instrument, Maturity Date |  |  |  | Sep. 15, 2043 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.30% | 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 |  |  |  |  | $ 690.7 | 690.6
Debt Instrument, Face Amount |  |  |  |  | $ 700.0 |
Debt Instrument, Maturity Date |  |  |  | Jun. 15, 2048 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.15% | 4.15% |
$750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 741.2 | $ 0.0
Debt Instrument, Face Amount |  |  |  |  | $ 750.0 |
Debt Instrument, Maturity Date |  |  |  | Mar. 15, 2032 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.65% | 2.65% |

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