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Guarantees - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Guarantees [Abstract]    
Deferred revenue included in accounts payable and accrued expenses and non-current liabilities $ 34.4 $ 29.7
Amount of residual value guarantees and buyback commitments given by the company $ 30.9 $ 28.2
Standard product warranty, low end of range (in months) 12 months  
Standard product warranty, high end of range (in months) 60 months