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Organization and Significant Accounting Policies - Revenue Recognition from Contract with Customers (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue recognized in the period from:        
Amounts included in contract liabilities at the beginning of the period $ 1.0 $ 2.9 $ 1.8 $ 2.6