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Significant Accounting Policies - Revenue Recognition/Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income taxes          
Reserves for recognized receivables $ 9.5   $ 9.5   $ 2.6
Federal, state and local tax provision (benefit) $ 0.0 $ (1.0) $ 2.0 $ 0.5