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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Total debt	$ 700.9	$ 839.6
Recorded Amount
Derivative [Line Items]
Variable rate debt	200.0	236.1
Fixed rate debt	507.6	611.4
Total debt	707.6	847.5
Fair Value
Derivative [Line Items]
Variable rate debt	200.0	236.1
Fixed rate debt	572.7	695.4
Total debt	$ 772.7	$ 931.5

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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