Share-Based Compensation - Schedule of Additional Information on Performance Shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
EBITDA CAGR [member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	0.2	0.2	0.3
Weighted average grant date fair value per share	$ 79.36	$ 58.40	$ 58.83
Aggregate intrinsic value of shares vested	$ 0.0	$ 0.0	$ 12.0
Free cash flow CAGR [member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	0.2	0.2
Weighted average grant date fair value per share	$ 79.36	$ 58.40
Aggregate intrinsic value of shares vested	$ 0.0	$ 0.0
Relative shareholder return [member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted			0.3
Weighted average grant date fair value per share			$ 62.43
Aggregate intrinsic value of shares vested			$ 16.0

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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