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Capital Stock and Equity Compensation (Additional Information) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) offering_periods | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Anniversary period from grant date | 13 months |  |
Total intrinsic value of options exercised in period | $ 2.4 | $ 6.0 |
Cash received from exercise of options exercised | $ 0.9 | $ 3.1 |
Weighted-Average Remaining Contractual Life in Years, Options outstanding | 2 years | 2 years 2 months |
Aggregate Intrinsic Value, Options outstanding | $ 0.7 | $ 4.2 |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0.3 | 0.5 |
Employee stock purchase plan number of offering periods | offering_periods | 2 |  |
Employee stock purchase plan length of offering periods | 6 months |  |
Discount from market price percentage | 15.00% |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Measurement period | 3 years |  |
Expected dividend yield | 0.00% |  |
Compensation expense | $ 4.4 | 4.7 | $ 4.6
Nonvested awards, total compensation cost not yet recognized | $ 6.0 |  |
Future compensation cost, period of recognition | 10 months 24 days |  |
Performance Shares | 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 Shares | 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] |  |  |
Compensation expense | $ 5.6 | 5.7 | 5.6
Nonvested awards, total compensation cost not yet recognized | $ 6.7 |  |
Future compensation cost, period of recognition | 10 months 24 days |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0.9 | $ 1.0 | $ 0.7
Anniversary period from grant date | 13 months |  |
Converstion ratio | 1 |  |
Employee stock option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options, contractual term (years) | 10 years |  |

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