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v3.22.1

Financing (Components Of Debt) (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term debt | $ 104.0 | $ 0.0
Long-term debt | 842.7 | 842.4
Debt discounts and debt issuance costs | $ 5.6 | $ 5.7
4.45% notes due December 2023 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 4.45% | 4.45%
Long-term debt | $ 299.5 | $ 299.4
6.55% notes due November 2036 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 6.55% | 6.55%
Long-term debt | $ 198.5 | $ 198.5
4.20% notes due March 2048 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate | 4.20% | 4.20%
Long-term debt | $ 346.4 | $ 346.3
Other deferred financing costs associated with credit facilities |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1.7 | 1.8
Commercial paper |  |
Debt Instrument [Line Items] |  |
Short-term debt | $ 104.0 | $ 0.0

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