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Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Contract Liabilities - Customer Loyalty Programs [Abstract]          
Contract liabilities for customer loyalty programs $ 16.0   $ 16.0   $ 12.5
Contract liabilities impact to revenue $ (4.1) $ 0.6 $ (3.5) $ 1.1