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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Total debt	$ 894.1	$ 839.6
Carrying (Reported) Amount, Fair Value Disclosure
Derivative [Line Items]
Variable rate debt	395.0	236.1
Fixed rate debt	507.6	611.4
Total debt	902.6	847.5
Estimate of Fair Value, Fair Value Disclosure
Derivative [Line Items]
Variable rate debt	395.0	236.1
Fixed rate debt	564.3	695.4
Total debt	$ 959.3	$ 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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