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Nature of Operations and Significant Accounting Policies - Unearned Revenue Liability (Details) - Benefits and Protection - Life Insurance - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Recent Accounting Pronouncements        
Unearned Revenue Liability $ 482.0 $ 467.4   $ 384.4
Universal life        
Recent Accounting Pronouncements        
Unearned Revenue Liability $ 473.6 $ 459.0 $ 425.3 384.4
Previously reported        
Recent Accounting Pronouncements        
Unearned Revenue Liability       335.6
Previously reported | Universal life        
Recent Accounting Pronouncements        
Unearned Revenue Liability       335.6
Adjustment for reversal of unrealized gain (loss) from AOCI | ASU 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts        
Recent Accounting Pronouncements        
Unearned Revenue Liability       48.8
Adjustment for reversal of unrealized gain (loss) from AOCI | ASU 2018-12 - Targeted improvements to the accounting for long-duration insurance contracts | Universal life        
Recent Accounting Pronouncements        
Unearned Revenue Liability       $ 48.8