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Financing (Components Of Debt) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 28, 2021 | Apr. 16, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2014 | Nov. 30, 2006
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | $ 0.0 | $ 375.7 |  |
Long-term debt |  |  | (842.4) | (842.9) |  |
Debt discounts and debt issuance costs |  |  | 5.7 | 6.6 |  |
4.45% notes due December 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ (299.4) | $ (299.1) |  |
Debt instrument interest rate |  |  | 4.45% | 4.45% | 4.45% |
6.55% notes due November 2036 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ (198.5) | $ (198.4) |  |
Debt instrument interest rate |  |  | 6.55% | 6.55% |  | 6.55%
4.20% notes due March 2048 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ (346.3) | $ (346.2) |  |
Debt instrument interest rate |  |  | 4.20% | 4.20% |  |
Other deferred financing costs associated with credit facilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  | $ (1.8) | $ (0.8) |  |
Commercial paper |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | 0.0 | 27.2 |  |
Debt instrument, term | 397 days |  |  |  |  |
Line of Credit | 364-Day Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  | $ 0.0 | $ 348.5 |  |
Notes Payable to Banks |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term |  | 364 days | 364 days | 364 days |  |

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