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Summary Of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
customer
segment
Dec. 31, 2017
USD ($)
customer
Dec. 31, 2016
USD ($)
customer
Jan. 01, 2018
USD ($)
Dec. 31, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent 9.10% 9.30%      
Other-than-temporary impairment losses $ 0 $ 0 $ 0    
Performance obligation period The Company’s system sale arrangements generally include a five-year period of service. The first year of service is generally free and included in the system sale arrangement and the remaining four years are generally included at a stated service price.        
Restricted cash $ 51,500,000 15,000,000 15,000,000    
Depreciation expense $ 105,900,000 82,100,000 70,700,000    
Number of operating segments | segment 1        
Impairment of goodwill $ 0        
System sales arrangement, warranty period 1 year        
Transaction price allocated to remaining performance obligations $ 1,448,700,000        
Revenue recognized 268,900,000 225,500,000      
Operating lease revenue $ 51,400,000 25,900,000 16,600,000    
Market-based implied volatility (period) 1 year        
Market-based implied volatility (percent) 100.00%        
Cash flow hedges de-designated (period) 2 months        
Likelihood of tax benefits being realized upon ultimate settlement 50.00%        
Operating expenses $ 1,404,700,000 1,139,100,000 943,200,000    
Retained earnings 1,521,700,000 115,000,000      
Net cash provided by operating activities 1,169,600,000 1,143,900,000 1,087,000,000    
Capitalized contract costs 34,200,000 31,400,000      
Net Cash Provided by (Used in) Financing Activities 126,300,000 (1,913,100,000) 514,400,000    
Undiscounted future minimum operating lease commitments $ 95,400,000        
ASU No. 2014-09          
Summary Of Significant Accounting Policies [Line Items]          
Operating expenses   1,139,100,000 943,200,000    
Retained earnings   115,000,000      
ASU No. 2014-09 | Difference between evenue guidance in effect before and after Topic 606          
Summary Of Significant Accounting Policies [Line Items]          
Retained earnings         $ 40,300,000
ASU 2016-16          
Summary Of Significant Accounting Policies [Line Items]          
Catch-up adjustment to retained earnings       $ 390,800,000  
ASU 2016-16 | Retained Earnings          
Summary Of Significant Accounting Policies [Line Items]          
Catch-up adjustment to retained earnings       $ 390,800,000  
ASU No. 2016-09          
Summary Of Significant Accounting Policies [Line Items]          
Net cash provided by operating activities     44,100,000    
Net Cash Provided by (Used in) Financing Activities     44,100,000    
Enterprise-wide software          
Summary Of Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives 5 years        
Internal use software          
Summary Of Significant Accounting Policies [Line Items]          
Capitalized computer software, gross $ 17,400,000 $ 22,400,000 $ 11,800,000    
Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life, intangible asset 1 year        
Sales-type leases term 24 months        
Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life, intangible asset 9 years        
Sales-type leases term 84 months        
Derivative, term of contract 12 months        
Maximum | Internal use software          
Summary Of Significant Accounting Policies [Line Items]          
Property, plant and equipment, estimated useful lives 5 years        
United States          
Summary Of Significant Accounting Policies [Line Items]          
Long-lived assets, percent 88.00% 88.00%      
Accounts Receivable | United States          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 71.00% 69.00%      
Total Revenue          
Summary Of Significant Accounting Policies [Line Items]          
Number of customers representing more than 10% of total revenue | customer 0 0 0    
Total Revenue | United States          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 71.00% 73.00% 72.00%    
Total Revenue | International          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 29.00% 27.00% 28.00%    
Early adoption | ASU 2018-02          
Summary Of Significant Accounting Policies [Line Items]          
Reclassification from AOCI to retained earnings $ 1,300,000