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Share-Based Compensation - Stock Options Narrative (Details) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award
Fair value of stock options granted	$ 34,200,000	$ 1,000,000.0	$ 800,000
Total intrinsic value of options exercised	200,000	8,200,000	50,800,000
Cash received for options exercised	900,000	$ 9,700,000	$ 41,900,000
Intrinsic value of exercisable options outstanding	$ 0
Weighted average fair value of options granted (in usd per share)	$ 18.36	$ 48.64	$ 48.05
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Options available for future grant under the Company's option plans (in shares)	0.3
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period of options	3 years
Expiration period of options	7 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period of options	5 years

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- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

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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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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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