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Organization and Summary of Accounting Policies - Rollforward of Goodwill (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill [Roll Forward]  
Goodwill, beginning of period $ 3,468.0
Acquisitions, including post acquisition adjustments 145.7
Divestitures and deconsolidations (0.1)
Goodwill, end of period $ 3,613.6