Stock-Based Compensation - Narrative (Details) $ in Millions	6 Months Ended
Jun. 30, 2016 USD ($) annual_installment shares	Jun. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserve for stock issuance (in shares)	14,900,000
Compensation expense for stock options \| $	$ 0.4	$ 1.6
Total unrecognized compensation expense related to outstanding stock options \| $	$ 0.6
Weighted average period	1 year
Total fair value of stock options vested during year \| $	$ 5.6
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period	3 years
Restricted stock or Performance shares awarded (in shares)	595,600
Number of annual vesting installments \| annual_installment	4
Award vesting period	4 years
Compensation expense \| $	$ 9.4	9.3
Total unrecognized compensation expense related to outstanding awards \| $	$ 40.2
Restricted Stock Units (RSUs) \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or Performance shares awarded (in shares)	45,900
Restricted Stock Units (RSUs) \| Executives and employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or Performance shares awarded (in shares)	525,285
Restricted Stock Units Earned as Dividend Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or Performance shares awarded (in shares)	24,424
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period	2 years 6 months
Restricted stock or Performance shares awarded (in shares)	385,100
Compensation expense \| $	$ 3.8	$ 0.8
Total unrecognized compensation expense related to outstanding awards \| $	$ 17.4
Percentage of award paid in stock	50.00%
Percentage of award paid in cash	50.00%
Award performance period	3 years
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded after performance period, as a percentage of targeted amount	0.00%
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded after performance period, as a percentage of targeted amount	150.00%
Performance Shares \| Executive officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or Performance shares awarded (in shares)	168,786
Performance Shares \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or Performance shares awarded (in shares)	211,924
Percentage of award paid in stock	100.00%
Performance Shares Earned as Dividend Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or Performance shares awarded (in shares)	4,412

Share-based Compensation Arrangement by Share-based Payment Award, Number of Annual Vesting Installments

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Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Award Paid in Cash

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Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Award Paid in Stock

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Share-based Compensation Arrangement by Share-based Payment Award, Shares Awarded After Performance Period, as a Percentage of Targeted Amount

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Total Fair Value of Stock Options Vested During Year

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Unrecognized cost of unvested share-based compensation awards.

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

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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).

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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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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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