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Treasury Stock Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Treasury Stock, Value [Abstract] |  |  |  |  |
Number of Treasury Shares Repurchased |  |  | 1,800,000 | 2,400,000 | 3,100,000
Cost of Shares Repurchased | [1] | $ 47.0 | $ 57.4 | $ 100.6 | $ 94.9
Commissions Paid on Stock Repurchases |  | 0.1 | 0.1 | 0.1 | 0.1
Share Repurchases Excise Tax |  | $ 0.4 | $ 0.0 | $ 0.5 | $ 0.0
[1] | 1Includes $0.1 million of commissions for the three and six months ended June 30, 2023 and $0.1 million of commission for the three and six months ended June 30, 2022. There was $0.4 million and $0.5 million of excise tax for the three and six months ended June 30, 2023, respectively. There were no excise taxes during the three and six months ended June 30, 2022.

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