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Equity Incentive Program - Stock Options and SSARs (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award        
Allocated share-based compensation expense $ 7.3 $ 6.2 $ 14.3 $ 12.1
SSARs        
Number of Shares [Roll Forward]        
Beginning balance     850,516  
Granted     0  
Exercised     30,624  
Forfeited     0  
Expired     (37,897)  
Ending balance 781,995   781,995  
Exercised 781,995   781,995  
Weighted Average Grant Date Fair Value        
Beginning balance     $ 21.54  
Granted     0.00  
Exercised     12.26  
Forfeited     0.00  
Expired     22.79  
Ending balance $ 21.85   21.85  
Exercisable $ 21.85   $ 21.85  
SARS and Options, Additional Disclosures        
SSARs, aggregate intrinsic value, outstanding $ 0.1   $ 0.1  
SSARs, aggregate intrinsic value, exercisable $ 0.1   $ 0.1  
SSARs, weighted average remaining contractual terms, outstanding     3 years 7 months  
SSARs, weighted average remaining contractual term, exercisable     3 years 7 months  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk-free interest rate     2.59%  
Dividend yield     0.00% 0.00%
Expected life (years)     4 years 6 months 4 years 6 months
Volatility     41.20%  
Stock Options, Number of Shares        
Beginning balance     4,901,739  
Granted     923,283  
Exercised     26,595  
Forfeited     (47,918)  
Expired     (140,839)  
Ending balance 5,609,670   5,609,670  
Exercisable 3,555,319   3,555,319  
Stock Options, Weighted Average Exercise Price        
Beginning balance     $ 18.36  
Granted     14.28  
Exercised     11.02  
Forfeited     15.91  
Expired     21.27  
Ending balance $ 17.67   17.67  
Exercisable $ 19.37   $ 19.37  
SARS and Options, Additional Disclosures        
Options, aggregate intrinsic value, outstanding $ 7.5   $ 7.5  
Options, aggregate intrinsic value, exercisable $ 4.3   $ 4.3  
Options, weighted average remaining contractual term, outstanding     4 years 7 months  
Options, weighted average remaining contractual term, exercisable     3 years 11 months  
Minimum | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk-free interest rate       1.73%
Volatility       38.10%
Fair value at date of grant     $ 4.83 $ 6.07
Maximum | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk-free interest rate       1.93%
Volatility       38.80%
Fair value at date of grant     $ 5.39 $ 6.73