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Revenue Recognition (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]            
Deferred Revenue $ 89,800,000 $ 85,600,000 $ 81,600,000 $ 67,700,000 $ 63,500,000 $ 59,900,000
Deferred Revenue, Current 32,400,000     28,800,000    
Deferred Revenue, Noncurrent $ 57,400,000     $ 38,900,000    
Minimum            
Deferred Revenue Arrangement [Line Items]            
Extended service warranty period 12 months          
Maximum            
Deferred Revenue Arrangement [Line Items]            
Extended service warranty period 84 months