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Business and Summary of Significant Accounting Policies - Remaining Performance Obligations (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Future estimated revenue $ 267.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected recognized percentage over succeeding 12 months 72.00%
Expected timing of satisfaction 4 years