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Stock-Based and Deferred Compensation Plans Performance Unit Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 5.6 $ 5.9 $ 5.1
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, 871 954 721
Non-vested at January 1, $ 17.30 $ 15.89 $ 16.77
Granted [1] 288 245 307
Granted $ 17.60 $ 22.03 $ 15.45
Vested (308) (229) (51)
Vested $ 15.45 $ 16.74 $ 22.75
Forfeited (159) (99) (23)
Forfeited $ 15.45 $ 16.62 $ 22.35
Non-vested at December 31, 692 871 954
Non-vested at December 31, $ 18.67 $ 17.30 $ 15.89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Compensation expense for the year $ 2.1 $ 3.9 $ 3.6
Tax benefit related to compensation expense (0.5) (1.4) (1.3)
Grant date fair value of awards vested 4.7 $ 3.8 $ 1.2
Unrecognized Compensation $ 7.7    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year    
[1] Assumes the maximum number of awards that can be earned if the performance conditions are achieved.