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Revenue Recognition (Extended Warranties and Post-Contract Support) (Details) - Extended warranties and post contract support - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Post-contract support contract, term   12 months  
Deferred revenue $ 35.8 $ 35.8 $ 38.0
Deferred revenue recognized 3.0 16.7  
Estimation of future revenues $ 22.1 $ 22.1  
Minimum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Extended product warranty, term   1 year  
Maximum      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Extended product warranty, term   5 years