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Stock-Based Compensation Plans (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Derivative Instruments Not Designated as Hedging Instruments, Gain | $ $ (5.5)   $ (3.7)    
Options approved, weighted average exercise price | $ / shares $ 13.34   $ 13.34   $ 13.34
Stock-based compensation expense | $ $ 4.6 $ 5.2 $ 13.1 $ 14.4  
Awards Classified as Liabilities [Domain]          
Stock-based compensation expense | $ $ 0.6 $ 0.7 $ 0.6 $ 1.6  
Time-Based Restricted Stock [Member]          
Restricted stock units, common shares to be issed upon exercise 1.4   1.4   1.3
Granted, shares 0.4   0.6 0.5  
Restricted stock units granted, weighted average fair value at date of grant | $ / shares $ 23.81   $ 23.59 $ 26.53  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 23.49   $ 23.49   $ 23.23
Total unrecognized compensation cost related to non-vested restricted stock and restricted stock units | $ $ 23.5   $ 23.5    
Weighted average recognition period (in years) 2.2   2.2    
Performance Shares [Member]          
Restricted stock units, common shares to be issed upon exercise 0.3   0.3   0.3
Granted, shares     0.3    
Restricted stock units granted, weighted average fair value at date of grant | $ / shares     $ 21.27    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 21.28   $ 21.28   $ 26.48
Performance Shares [Member] | Maximum [Member]          
Payout range     200.00%    
Performance Shares [Member] | Minimum [Member]          
Payout range     50.00%    
2014 Performance grants [Domain] | Performance Shares [Member]          
Total unrecognized compensation cost related to non-vested restricted stock and restricted stock units | $ $ 2.2   $ 2.2    
Key terms not yet established [Member] | Performance Shares [Member]          
Granted, shares     0.3    
Various Dates [Domain] | Performance Shares [Member]          
Granted, shares     0.3