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v3.20.2

Debt and Credit Arrangements Debt Transactions (Details) - 4.75% Notes Due 2030 (less unamortized discount and issuance costs of $3.7 and $6.0, respectively) $ in Millions | Jun. 30, 2020 USD ($)
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Debt Instrument [Line Items] |
Par Value | $ 650.0
Debt Instrument, Interest Rate, Stated Percentage | 4.75%
Unsecured Debt | $ 640.0
Debt Instrument, Unamortized Discount | 3.8
Debt Issuance Costs, Gross | $ 6.2

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