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Share-Based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Dec. 31, 2012
shares
Compensation cost for share-based payments | $ $ 51.2 $ 38.9 $ 43.3  
Restricted Stock Units [Member]        
Fair value vested during period | $ $ 10.1      
Granted, restricted stock and units 2,938,000      
Granted, weighted-average grant-date fair value | $ / shares $ 7.91      
Vested, restricted stock and units 1,084,000      
Nonvested, ending balance, restricted stock and units 6,022,000 4,995,000    
Performance Restricted Stock Units [Member]        
Granted, restricted stock and units 2,013,000      
Granted, weighted-average grant-date fair value | $ / shares $ 7.49      
Vested, restricted stock and units 0      
Nonvested, ending balance, restricted stock and units [1] 5,334,000 4,976,000    
Restricted Stock Units and Performance Restricted Stock Units [Member]        
Unrecognized compensation cost | $ $ 45.4      
Unrecognized compensation costs, recognized over a weighted average period 1 year 8 months 12 days      
2010 Plan [Member]        
Multiplier for grant award 2.33      
Maximum award, number of shares 32,000,000      
Two Thousand And Thirteen Plan [Member]        
Multiplier for grant award 3.13      
Maximum award, number of shares 55,000,000      
Restricted Stock Units - Treasury Stock [Member]        
Unrecognized compensation cost | $ $ 2.5      
Vested, restricted stock and units 40,000      
Nonvested, ending balance, restricted stock and units [1] 569,596      
Compensation cost for share-based payments | $ $ 2.7 $ 0.8 $ 1.4  
2013 [Member] | Performance Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award In 2013, we granted performance restricted stock units that would vest and settle after three years only upon the satisfaction of certain performance conditions over three years.      
2014 [Member] | Performance Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award In 2014, we granted performance restricted stock units that would vest and settle after three years only upon the satisfaction of certain performance conditions over three years.      
2015 [Member] | Performance Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award In 2015, we granted performance restricted stock units that would vest and settle after three years only upon the satisfaction of certain performance conditions over two years ("2015 PRSUs"). In addition, if the performance conditions are achieved above target, these performance restricted stock units are subject to a market condition in which the number of performance restricted stock units that vest will be limited to the target amount if the Company’s absolute total shareholder return during the three-year service period is negative. If the performance conditions are achieved, the range of possible payouts of these performance restricted stock units is limited to a minimum of 50% of target to a maximum of 150% of target.      
2015 [Member] | Restricted Stock Units - Treasury Stock [Member]        
Vesting period, years 3 years      
Granted, restricted stock and units 489,596      
Granted, weighted-average grant-date fair value | $ / shares $ 9.00      
2015 [Member] | Performance Restricted Stock Units - Treasury Stock [Member]        
Unrecognized compensation cost | $ $ 0.7      
Granted, restricted stock and units 121,951      
Granted, weighted-average grant-date fair value | $ / shares $ 7.49      
Nonvested, ending balance, restricted stock and units [1] 121,951      
Compensation cost for share-based payments | $ $ 0.2      
Late 2015 [Member] | Performance Restricted Stock Units [Member]        
Unrecognized compensation cost | $ $ 3.0      
Granted, restricted stock and units 1,123,183      
Compensation cost for share-based payments | $ $ 1.6      
2012 [Member] | Restricted Stock Units - Treasury Stock [Member]        
Vesting period, years 5 years      
Granted, restricted stock and units       200,000
Granted, weighted-average grant-date fair value | $ / shares $ 21.69      
2010 Plan [Member] | Stock Options [Member]        
Vesting period, years 3 years      
Contractual term, years 10 years      
2010 Plan [Member] | SARs [Member]        
Vesting period, years 3 years      
2010 Plan [Member] | Restricted Stock Units [Member]        
Vesting period, years 3 years      
2010 Plan [Member] | Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
2010 Plan [Member] | Director [Member] | Restricted Stock Units [Member]        
Vesting period, years 1 year      
2013 Plan [Member] | Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 3 years      
2013 Plan [Member] | Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 3 years      
2015 PRSUs [Member] | Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 2 years      
Minimum [Member]        
Target payout, percentage 50.00%      
Maximum [Member]        
Target payout, percentage 150.00%      
[1] Based on initial target payout.