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Revenue from Contracts with Customers - Accounts Receivable Reserve for Doubtful Accounts (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Allowance for Doubtful Accounts Receivable [Roll Forward]  
Balance as of January 1, 2018 $ 5.9
Expense to increase the reserve 0.7
Write-off of uncollectible accounts (0.4)
Balance as of September 30, 2018 $ 6.2