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Revenue Recognition Contract Costs (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Revenue Recognition [Abstract]    
Capitalized contract cost, amortization term 5 years 5 years
Capitalized contract cost $ 9.5 $ 9.5
Amortization associated with capitalized costs $ 0.8 $ 2.3