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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Share-Based Compensation Expense
Total share-based compensation expense related to the Company's stock options, RSUs, stock grant awards and ESPP were recorded within the Consolidated Statements of Operations and Comprehensive Income as follows (in millions):
Year Ended December 31,
2019 2018 2017
Cost of revenue $ 10.6    $ 7.0    $ 6.0   
Research and development 17.0    14.3    12.5   
Selling and marketing 14.8    14.1    11.7   
General and administrative 37.0    42.9    39.6   
Share-based compensation expense 79.4    78.3    69.8   
Related income tax benefits at federal rate (1) (16.7)   (16.4)   (24.4)  
Share-based compensation expense, net of taxes $ 62.7    $ 61.9    $ 45.4   
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(1)Recognition of related income tax benefits are the result of the adoption of ASU 2016-09 during the first quarter of 2017 through a cumulative effect adjustment of $68.1 million recorded as a credit to retained earnings as of January 1, 2017. Tax benefit is calculated using the federal statutory rate of 21% during the years ended December 31, 2019 and December 31, 2018, and 35% for the year ended December 31, 2017.
Summary of Restricted Stock Units Transactions
A summary of the RSU transactions for the year ended December 31, 2019 are as follows (number of shares in millions):
  Number of Shares Weighted-Average Grant Date Fair Value
Nonvested shares of RSUs at December 31, 2018 8.6    $ 16.59   
Granted 5.4    21.64   
Achieved 0.2    24.46   
Released (4.8)   14.41   
Canceled (0.5)   19.74   
Nonvested shares of RSUs at December 31, 2019 8.9    20.84