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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
USD ($)
Aug. 24, 2017
JPY (¥)
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Recorded expense associated with doubtful accounts $ 49.0 $ 38.0 $ 31.0      
Net aggregate financing receivables   247.0     $ 263.0  
Gains (losses) related to net investment hedge $ 9.4 $ (18.8) $ 0.6      
Yen variable interest rate term loan due 2022            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Line of credit facility, maximum borrowing capacity | ¥       ¥ 13,800,000,000   ¥ 13,800,000,000