XML 100 R83.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based and Deferred Compensation Plans Performance Unit Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 5.9 $ 5.1 $ 4.1
Performance Based Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Non-vested at January 1, 954 721 349
Non-vested at January 1, $ 15.89 $ 16.77 $ 19.28
Granted [1] 245 307 538
Granted $ 22.03 $ 15.45 $ 15.46
Vested (229) (51) (89)
Vested $ 16.74 $ 22.75 $ 19.00
Forfeited (99) (23) (77)
Forfeited $ 16.62 $ 22.35 $ 16.44
Non-vested at December 31, 871 954 721
Non-vested at December 31, $ 17.30 $ 15.89 $ 16.77
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 3.9 $ 3.6 $ 3.1
Tax benefit related to compensation expense (1.4) (1.3) (1.1)
Grant date fair value of awards vested 3.8 1.2 1.7
Unrecognized Compensation $ 7.6    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year    
Performance Based Cash Unit Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year   2.2 0.6
Unrecognized Compensation $ 0.0    
Fair Value of Grants in Period $ 0.0 $ 0.0 $ 0.0
[1] Assumes the maximum number of awards that can be earned if the performance conditions are achieved.