Share-Based Compensation - Additional Information (Details) - USD ($) 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 [Line Items]
Share-based compensation expense	$ 127.0	$ 121.0	$ 81.0
Tax benefit	42.0	49.0	31.0
Accrued liabilities	15.0	15.0
Unrecognized compensation costs related to unvested awards	$ 121.0
Unrecognized compensation costs related to unvested awards, weighted-average period	1 year 8 months
Shares of common stock reserved for future issuance	16.1
Incremental share based compensation expense	$ 2.3	$ 3.3	$ 0.3
EBITDA CAGR [member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage	50.00%
Free cash flow CAGR [member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage	50.00%

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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- Definition

Percentage of vesting of share-based compensation awards.

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