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Financing Arrangements (Fair Value of Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amount	$ 350.0	$ 350.0
Fair value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value	$ 351.3	$ 361.8

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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