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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Level 2 [Member] | Senior Unsecured Notes [Member] |  |
Other Fair Value Measurements |  |
Senior unsecured notes | $ 913.9 | $ 959.2

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