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Stock-Based Compensation - Schedule of Grant Date (Details) $ / shares in Units, $ in Millions				12 Months Ended
	Jun. 24, 2020 USD ($) grantee $ / shares shares	Mar. 16, 2020 USD ($) grantee $ / shares shares	Mar. 20, 2019 USD ($) grantee $ / shares shares	Dec. 31, 2020 $ / shares	Dec. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of grantees affected | grantee		332	215
Risk-free rate		0.20%	0.18%	0.58%	2.37%	2.69%
Stock price (in dollars per share)		$ 173.15	$ 173.15
Volatility		51.32%	62.29%
Shares at target (in shares) | shares		199,870	86,845
Fair value per share (in dollars per share)		$ 280.93	$ 188.21	$ 35.13	$ 58.28	$ 51.27
Total incremental compensation cost | $		$ 21.8	$ 1.3
Vesting period				3 years
Stock Options, Non-CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of grantees affected | grantee	134
Risk-free rate	0.21%
Stock price (in dollars per share)	$ 160.14
Volatility	47.72%
Shares at target (in shares) | shares	110,467
Fair value per share (in dollars per share)	$ 264.17
Total incremental compensation cost | $	$ 11.5
Stock Options, CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of grantees affected | grantee	1
Risk-free rate	0.21%
Stock price (in dollars per share)	$ 160.14
Volatility	47.72%
Shares at target (in shares) | shares	28,101
Fair value per share (in dollars per share)	$ 240.55
Total incremental compensation cost | $	$ 2.3

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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