Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Narrative for Revenue Recognition (Details)

v3.10.0.1
Basis of Presentation - Narrative for Revenue Recognition (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Short-term contract liability $ 16.8
Long-term contract liability 4.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 6.3
Expected timing of satisfaction for remaining performance obligation 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 11.2
Expected timing of satisfaction for remaining performance obligation 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 1.8
Expected timing of satisfaction for remaining performance obligation 2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 0.9
Expected timing of satisfaction for remaining performance obligation 3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 0.7
Expected timing of satisfaction for remaining performance obligation