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Stock-Based Compensation (Additional Information) (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 51 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) offering_periods | Jun. 30, 2015 USD ($) | Jun. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options |  |  | $ 2.1 |  |
Deferred Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense (income) | $ 0.7 | $ 0.7 | $ 0.7 | $ 0.7 |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options, contractual term (years) |  |  | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  | 0
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 3.00% |  |
Compensation expense (income) | 0.0 | 0.1 | $ 0.0 | 0.1 |
Options exercised, total intrinsic value |  |  | $ 1.4 |  |
Performance-Based Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 12.00% |  |
Compensation expense (income) | 1.4 | 1.2 | $ 2.1 | 1.6 |
Restricted stock award program, measurement period (years) |  |  | 3 years |  |
Expected dividend yield (percent) |  |  | 0.00% |  |
Performance-Based Restricted Stock | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 0.00% |  |
Performance-Based Restricted Stock | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 200.00% |  |
Time Based Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 12.00% |  |
Compensation expense (income) | 1.5 | 1.3 | $ 2.7 | 2.4 |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense (income) | $ 0.1 | $ 0.1 | $ 0.2 | $ 0.2 |
Employee stock purchase plan, number of offering (offering period) | offering_periods |  |  | 2 |  |
Employee stock purchase plan, offering period (months) |  |  | 6 months |  |
Employee stock purchase plan, purchase price discount (percent) |  |  | 15.00% |  |

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