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Organization and Significant Accounting Policies - Revenue Recognition from Contract with Customers (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue recognized in the period from:        
Amounts included in contract liabilities at the beginning of the period $ 0.8 $ 2.0 $ 1.3 $ 2.6