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Stock-Based Compensation - Stock Option Activity (Details) - Stock Options $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Shares
Outstanding, beginning of period (in shares) | shares	1,014,670
Granted (in shares) | shares	91,743
Exercised (in shares) | shares	(428,376)
Expired (in shares) | shares	(20,169)
Forfeited (in shares) | shares	(36,093)
Outstanding, end of period (in shares) | shares	621,775
Vested and expected to vest (in shares) | shares	595,541
Exercisable (in shares) | shares	423,603
Weighted Average Exercise Price
Beginning of period (USD per share) | $ / shares	$ 64.16
Granted (USD per share) | $ / shares	74.57
Exercised (USD per share) | $ / shares	45.48
Expired (USD per share) | $ / shares	98.11
Forfeited (USD per share) | $ / shares	88.46
End of period (USD per share) | $ / shares	76.06
Vested and expected to vest (USD per share) | $ / shares	75.87
Exercisable (USD per share) | $ / shares	$ 72.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term (in years)	6 years 8 months 12 days
Weighted average remaining contractual term, vested and expected to vest (in years)	6 years 7 months 6 days
Weighted average remaining contractual term, exercisable (in years)	5 years 7 months 6 days
Options, outstanding, intrinsic value | $	$ 10.5
Options, vested and expected to vest, intrinsic value | $	10.2
Options, vested and expected to vest, exercisable | $	$ 8.7

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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