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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Total debt	$ 911.5	$ 894.1
Recorded Amount
Derivative [Line Items]
Variable rate debt	415.0	395.0
Fixed rate debt	507.6	507.6
Total debt	922.6	902.6
Fair Value
Derivative [Line Items]
Variable rate debt	415.0	395.0
Fixed rate debt	490.2	564.3
Total debt	$ 905.2	$ 959.3

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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