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Significant Accounting Policies Deferred Revenue (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]                
Deferred Revenue $ 98,300,000 $ 72,400,000 $ 98,300,000 $ 72,400,000 $ 89,800,000 $ 81,600,000 $ 67,700,000 $ 59,900,000
New contracts sold 15,800,000 11,100,000 42,600,000 32,500,000        
Less: reductions for revenue recognized (7,300,000) (6,400,000) (25,900,000) (20,000,000.0)        
Deferred Revenue, Current 35,100,000 30,700,000 35,100,000 30,700,000        
Deferred Revenue, Noncurrent $ 63,200,000 $ 41,700,000 $ 63,200,000 $ 41,700,000