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v3.21.2

Financing (Components Of Debt) (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term debt | $ 0.0 | $ 375.7
Long-term debt | 842.2 | 842.9
Debt discounts and debt issuance costs | $ 5.8 | $ 6.6
4.45% notes due December 2023 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 4.45% | 4.45%
Long-term debt | $ 299.3 | $ 299.1
6.55% notes due November 2036 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 6.55% | 6.55%
Long-term debt | $ 198.5 | $ 198.4
4.20% notes due March 2048 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 4.20% | 4.20%
Long-term debt | $ 346.3 | $ 346.2
Other Deferred Financing Costs |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1.9 | 0.8
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short-term debt | 0.0 | 27.2
Line of Credit | 364-Day Credit Agreement |  |
Debt Instrument [Line Items] |  |
Short-term debt | $ 0.0 | $ 348.5

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