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The intrinsic value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology.

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The grant-date intrinsic value of other than options granted during the reporting period as calculated by applying the disclosed pricing methodology.

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Compensation Plans

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Amount of benefit recorded in the statement of income as a result of re-evaluation of performance-based restricted stock Units granted.

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Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, EBITDA Performance Target

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Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Percentage of Target Shares Vested

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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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No definition available.

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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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Gross number of share options (or share units) granted during the period.

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No definition available.

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Number of options outstanding, including both vested and non-vested options.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Percentage of vesting of share-based compensation awards.

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

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Stock-based Compensation - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) plan shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015	May 11, 2017 shares	Dec. 31, 2003 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of compensation plans \| plan		2
Total stock-based compensation expense	$ 22.5	$ 13.3	$ 16.2
Total intrinsic value of options exercised	71.8	5.4	$ 23.9
Stock options granted \| shares			0
Cash received from exercise of stock options	20.4	12.8	$ 15.7
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	6.6	7.1	5.3
Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	13.7	(6.5)	3.9
Revaluation benefit from PRSU Granted		9.3	3.8
Total intrinsic value of options exercised		2.9
Outstanding intrinsic value		$ 173.6
Performance-based Restricted Stock Units \| Treasury Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date intrinsic value			$ 5.6
Percentage of stock units released		71.20%	79.00%
Maximum payout (percent)		300.00%	200.00%
Performance period (in years)				2 years
Performance-based Restricted Stock Units \| Chief Executive Officer \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target shares vested, percentage			50.00%
Restricted Stock Units and Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 2.2	$ 12.7	$ 7.0
Aggregate intrinsic value of RSUs and DSUs vested during the period		4.6
Long Term Incentive Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common stock shares to be issued (in shares) \| shares					8,700,000
Amended And Restated 2003 Equity Incentive Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common stock shares to be issued (in shares) \| shares						11,500,000
Aspirational Plan \| Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		650.0
Unrecognized compensation expense		$ 74.7
Aspirational Plan \| Performance-based Restricted Stock Units \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding \| shares		1,000,000
Aspirational Plan \| Performance-based Restricted Stock Units \| Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding \| shares		0
Aspirational Plan \| Performance-based Restricted Stock Units \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 85.5
Vesting Scenario One \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		$ 600.0
Vesting rights, percentage		66.00%
Vesting Scenario One \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		$ 600.0
Vesting rights, percentage		66.00%
Vesting Scenario Two \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		$ 650.0
Vesting rights, percentage		100.00%
Vesting Scenario Two \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		$ 650.0
Vesting rights, percentage		100.00%
Vesting Scenario Four \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		$ 600.0
Vesting Scenario Four \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		600.0
Minimum \| Vesting Scenario Three \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		600.0
Minimum \| Vesting Scenario Three \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		600.0
Maximum \| Vesting Scenario Three \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		650.0
Maximum \| Vesting Scenario Three \| Aspirational Plan 2019 \| Performance-based Restricted Stock Units \| Tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum Adjusted EBITDA		$ 650.0