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Financing (Components Of Debt) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term debt | $ 15.0 | $ 375.7
Long-term debt | (843.4) | (842.9)
Debt discounts and debt issuance costs | 6.0 | 6.6
4.45% notes due December 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ (299.2) | $ (299.1)
Debt instrument, interest rate | 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%
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 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ (0.6) | $ (0.8)
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short-term debt | 15.0 | 27.2
Line of Credit | 364-Day Credit Agreement |  |
Debt Instrument [Line Items] |  |
Short-term debt | $ 0.0 | $ 348.5

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