Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Income Taxes (Details)

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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Total effect of income tax reform $ 31.0    
Unrecognized tax benefits   $ 0.0 $ 0.0