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Revenue Recognition (Up-Front Customer Loyalty Programs) (Details) - Up front customer loyalty programs - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Disaggregation of Revenue [Line Items]      
Capitalized customer acquisition costs $ 119.8 $ 119.8 $ 107.5
Recognized as a reduction of revenue $ 7.1 $ 21.5