XML 142 R96.htm IDEA: XBRL DOCUMENT v3.10.0.1
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%