XML 49 R39.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 27, 2017
shares
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized     150,000,000   150,000,000
Stock compensation expense | $     $ 12.0 $ 5.5  
2006 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized     10,000,000    
Shares available for grant, shares     2,974,390    
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant-date fair value of performance awards granted, dollars per share | $ / shares     $ 61.83 $ 47.94  
Shares awarded     531,596    
Share-based compensation cost not yet recognized | $     $ 51.5    
Share-based compensation, recognition period of unrecognized compensation cost, years     2 years    
waived stock award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | $     $ 4.8    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant-date fair value of performance awards granted, dollars per share | $ / shares     $ 61.83 $ 45.05  
Shares awarded     108,588    
Share-based compensation cost not yet recognized | $     $ 11.6    
Share-based compensation, recognition period of unrecognized compensation cost, years     2 years    
Shares received for every restricted stock unit award given     1    
Requisite period     3 years    
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation cost not yet recognized | $     $ 6.7    
Vesting Year One [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage     33.33%    
Vesting Year Two [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage     33.33%    
Vesting Year Three [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage     33.33%    
Subsequent Event [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock issued, shares 14,968        
Restricted common stocks issued, shares 12,066        
Scenario, Forecast [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock compensation expense | $   $ 1.0