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Equity Incentive Programs (Equity Incentive Programs and Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate shares of common stock reserved (in shares) 7,871,652   7,871,652  
Stock option exercise price floor of fair market value of class A common stock (percent)     100.00%  
Shares available for issuance (in shares) 68,177   68,177  
Stock-based compensation $ 3.0 $ 3.2 $ 8.2 $ 5.9
Estimated future compensation expense 20.5   20.5  
Tax benefit (expense) on equity award activity in operating activities section of cash flow statement     (0.5)  
Tax benefit (expense) on equity award activity in financing activities section of cash flow statement     $ 0.0 $ 1.6
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Estimated Expense in 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense 6.5   $ 6.5  
Estimated Expense in 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense 8.9   8.9  
Estimated Expense in 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense 4.5   4.5  
Estimated Expense in 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense $ 0.6   $ 0.6