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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes the activity and related information for RSUs for the periods presented below (in millions, except per share amounts):
 Restricted Stock Units Outstanding
 Number of SharesWeighted-Average Grant Date Fair Value per Share
Balance—December 31, 20196.1  $64.56  
Granted1.6  120.02  
Forfeited(0.2) 72.69  
Vested(1.7) 56.98  
Balance—June 30, 20205.8  $81.49  
Schedule of Share-based Compensation, Shares Withheld for Taxes
The following summarizes the number and value of the shares withheld for employee taxes (in millions):
Three Months EndedSix Months Ended
June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Shares withheld for taxes0.2  0.3  0.5  0.7  
Amount withheld for taxes$21.1  $24.5  $58.9  $56.5  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the weighted-average assumptions relating to our employee stock options: 
 Three Months EndedSix Months Ended
 June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Expected term in years4.44.44.44.4
Volatility39.0 %34.4 %34.4 %34.2 %
Risk-free interest rate0.3 %2.2 %1.1 %2.5 %
Dividend rate— %— %— %— %
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes the stock option activity and related information for the periods presented below (in millions, except exercise prices and contractual life):
 Options Outstanding
 Number
of Shares		Weighted-
Average
Exercise
Price 		Weighted-
Average
Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
Balance—December 31, 20192.7  $50.37  
Granted0.6  118.50  
Forfeited—  80.97  
Exercised(0.4) 40.78  
Balance—June 30, 20202.9  $66.01  
Options vested and expected to vest—June 30, 20202.9  $66.01  4.7$206.0  
Options exercisable—June 30, 20201.4  $41.09  3.5$134.3  
Schedule of Share-based Compensation, Stock Options, Activity, Additional Information
Additional information related to our stock options is summarized below (in millions, except per share amounts):
Three Months EndedSix Months Ended
June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Weighted-average fair value per share granted $46.92  $26.38  $35.51  $27.08  
Intrinsic value of options exercised $17.3  $9.6  30.4  36.8  
Fair value of options vested$2.4  $2.0  8.4  6.2  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Stock-based compensation expense, including stock-based compensation expense related to awards classified as liabilities, is included in costs and expenses as follows (in millions):
 Three Months EndedSix Months Ended
 June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Cost of product revenue$0.4  $0.4  $0.8  $0.8  
Cost of service revenue3.2  2.9  6.2  5.7  
Research and development12.0  10.0  22.9  19.4  
Sales and marketing27.9  26.3  53.6  51.7  
General and administrative6.1  5.4  11.4  10.4  
Total stock-based compensation expense$49.6  $45.0  $94.9  $88.0  
Schedule of Employee Service Share based Compensation Allocation of Recognized Period Costs by Award Type
The following table summarizes stock-based compensation expense, including stock-based compensation expense related to awards classified as liabilities, by award type (in millions):
 Three Months EndedSix Months Ended
 June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
RSUs$45.9  $41.9  $88.1  $81.1  
Stock options3.7  3.1  6.8  5.6  
ESPP—  —  —  1.3  
Total stock-based compensation expense$49.6  $45.0  $94.9  $88.0  
Income Tax Benefit from Stock Option Plans
Total income tax benefit associated with stock-based compensation that is recognized in the condensed consolidated statements of income is as follows (in millions):
Three Months EndedSix Months Ended
June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Income tax benefit associated with stock-based compensation $10.9  $10.4  $20.9  $20.4