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Share-Based Compensation - Stock Options Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Fair value of stock options granted	$ 1.0	$ 0.8	$ 16.4
Total intrinsic value of options exercised	8.2	50.8	27.7
Cash received for options exercised	9.7	$ 41.9	$ 25.6
Intrinsic value of exercisable options outstanding	$ 0.3
Weighted average fair value of options granted (in usd per share)	$ 48.64	$ 48.05	$ 39.02
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Options available for future grant under the Company's option plans (in shares)	3.1
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	4 years

X

- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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