Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Stock-Based Compensation
Stock-based compensation expense	$ 4.4	$ 1.3
Separation expense	$ 0.9	$ 3.0
Number of share options granted during the period (in shares)	300,000	300,000
Restructuring Expense
Stock-Based Compensation
Stock-based compensation expense	$ 2.0
Selling, General and Administrative Expenses
Stock-Based Compensation
Stock-based compensation expense	$ 2.4
Restricted Stock Units
Stock-Based Compensation
Stock-based compensation expense		$ 0.8
Separation expense		$ 0.5
Shares issued (in shares)	400,000	300,000
2016 Plan
Stock-Based Compensation
Number of shares of common stock authorized under the plan (in shares)	16,200,000.0
2016 Plan \| Stock Options
Stock-Based Compensation
Vesting period (in years)	4 years
Vesting rights percentage (as a percent)	25.00%
2016 Plan \| Performance shares
Stock-Based Compensation
Vesting rights percentage (as a percent)	75.00%
Performance period	3 years

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

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Number of share instruments newly issued under a share-based compensation plan.

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Percentage of vesting of share-based compensation awards.

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Costs associated with proposed separation

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Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

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