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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2018 shares | Mar. 21, 2018 shares | Feb. 06, 2018 shares | Feb. 17, 2017 shares | Feb. 09, 2016 shares | Jun. 12, 2014 shares | Dec. 31, 2018 USD ($) performance_period $ / shares shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Jun. 09, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  | $ 12.0 | $ 7.8 | $ 6.9 |
Weighted-average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 9.88 | $ 4.48 | $ 3.97 |
Intrinsic value of stock options exercised |  |  |  |  |  |  | $ 28.7 | $ 15.8 | $ 10.3 |
Unamortized compensation costs, stock options |  |  |  |  |  |  | $ 9.7 |  |  |
Pinnacle |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awards granted (in shares) | shares | 129,961 |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Low end of exercise price range (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 8.88 |  |  |
High end of exercise price range (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 32.90 |  |  |
Unamortized compensation costs, weighted average period of recognition |  |  |  |  |  |  | 4 years |  |  |
Stock options | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual lives |  |  |  |  |  |  | 1 year |  |  |
Stock options | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual lives |  |  |  |  |  |  | 10 years |  |  |
Restricted stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awards granted (in shares) | shares |  |  |  |  |  |  | 333,478 |  |  |
Unamortized compensation costs, weighted average period of recognition |  |  |  |  |  |  | 4 years |  |  |
Unrecognized compensation cost, other awards |  |  |  |  |  |  | $ 7.4 |  |  |
Phantom share units (PSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  | $ 1.1 | 11.9 | 8.5 |
Unamortized compensation costs, weighted average period of recognition |  |  |  |  |  |  | 2 years 18 days |  |  |
Unrecognized compensation cost, other awards |  |  |  |  |  |  | $ 3.0 |  |  |
Liability for cash-settled awards |  |  |  |  |  |  | 1.7 | 4.8 |  |
Amounts paid on cash-settled awards |  |  |  |  |  |  | $ 4.2 | 12.7 | 10.7 |
Phantom share units (PSUs) | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 3 years |  |  |
Phantom share units (PSUs) | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |  |  |
Stock appreciation rights (SARs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 4 years |  |  |
Stock-based compensation expense |  |  |  |  |  |  | $ (6.7) | 21.9 | 2.4 |
Unamortized compensation costs, weighted average period of recognition |  |  |  |  |  |  | 1 year 11 months 12 days |  |  |
Unrecognized compensation cost, other awards |  |  |  |  |  |  | $ 4.5 |  |  |
Liability for cash-settled awards |  |  |  |  |  |  | 6.8 | 24.0 |  |
Amounts paid on cash-settled awards |  |  |  |  |  |  | $ 10.5 | $ 6.2 | $ 3.3 |
2008 Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock available for awards, up to (in shares) | shares |  |  |  |  |  | 16,350,000 |  |  |  | 6,900,000
2008 Plan | Stock options and stock appreciation rights (SARs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock counted against the maximum shares available for grant for each share awarded under the plan (in shares) | shares |  |  |  |  |  | 1 |  |  |  |
2008 Plan | Restricted stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock counted against the maximum shares available for grant for each share awarded under the plan (in shares) | shares |  |  |  |  |  | 2.44 |  |  |  |
2018 Long Term Incentive Compensation Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock available for awards, up to (in shares) | shares |  | 12,700,000 |  |  |  |  |  |  |  |
Common stock counted against the maximum shares available for grant for each share awarded under the plan (in shares) | shares |  | 1 |  |  |  |  |  |  |  |
Shares available for future grants (in shares) | shares |  |  |  |  |  |  | 11,921,545 |  |  |
2018 Long Term Incentive Compensation Plan | Restricted stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock counted against the maximum shares available for grant for each share awarded under the plan (in shares) | shares |  | 2.30 |  |  |  |  |  |  |  |
Performance Share Program | Performance shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Awards granted (in shares) | shares |  |  | 197,727 | 172,245 | 189,085 |  |  |  |  |
Award period |  |  |  |  |  |  | 3 years |  |  |
Number of annual award performance periods | performance_period |  |  |  |  |  |  | 3 |  |  |
Service period |  |  |  |  |  |  | 3 years |  |  |
Vesting period |  |  |  |  |  |  | 3 years |  |  |
Performance Share Program | Performance shares | Vesting tranche one |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Increment percentage at which shares are awarded |  |  |  |  |  |  | 33.33% |  |  |
Performance Share Program | Performance shares | Vesting tranche two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Increment percentage at which shares are awarded |  |  |  |  |  |  | 33.33% |  |  |
Performance Share Program | Performance shares | Vesting tranche three |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Increment percentage at which shares are awarded |  |  |  |  |  |  | 33.33% |  |  |
Performance Share Program | Performance shares | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of award which can potentially be earned |  |  |  |  |  |  | 0.00% |  |  |
Performance Share Program | Performance shares | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of award which can potentially be earned |  |  |  |  |  |  | 150.00% |  |  |

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