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Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts and Contractual Allowance (Parenthetical) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Sep. 30, 2018
Receivables [Abstract]      
Allowance for contractual adjustments increased $ 1.4 $ 2.0 $ 2.7
Provision for doubtful accounts reduced $ 1.4 $ 2.0 2.7
Contractual adjustments increased     0.6
Allowance for contractual adjustments reduced     $ 0.6