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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020	May 31, 2018	May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair values of stock options granted (in USD per share)	$ 45.67	$ 41.74	$ 43.42
Stock options exercised in period intrinsic value	$ 40.2	$ 64.3	$ 117.0
Cash received from stock option exercises	$ 23.5	27.3	29.5
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock authorized for issuance (in shares)	200,000				300,000
ESPP | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discounted purchase price percentage of common stock authorized for issuance	85.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options	10 years
Unrecognized expense	$ 86.2
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Total intrinsic value vested in period	$ 49.7	$ 36.1	$ 35.5
Unrecognized expense	99.5
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense	17.0
Total fair value of PRSUs vested	$ 13.5
PRSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
PRSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock authorized for issuance (in shares)	0					21,000,000
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock authorized for issuance (in shares)	8,200,000			3,300,000

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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