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Nature of Operations and Significant Accounting Policies - Cash and Cash Equivalents, Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents    
Maximum maturity period when purchased for investments to be included in cash and cash equivalents 3 months  
Investments    
Real estate held for sale $ 240.6 $ 88.7