Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity $ 1,666.8 $ 1,192.8 $ 1,108.0 $ 1,277.8 $ 1,254.6 $ 1,232.2  
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity $ 1,289.2 $ 842.0 $ 812.0 $ 737.1 $ 699.1 $ 666.2  
Retained Earnings | Accounting Standards Update 2018-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' equity             $ 6.0