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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
May 12, 2017
shares
Dec. 31, 2016
shares
Sep. 30, 2017
shares
Dec. 31, 2019
USD ($)
plan
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock incentive plans | plan       2    
Maximum number of shares issuable under plan (in shares) (up to)       46,374,756    
Income tax benefit (expense), vesting and exercises of equity awards | $       $ 8.2 $ 2.4 $ (0.9)
Weighted-average grant date fair value of options granted (in dollars per share) | $ / shares       $ 4.25 $ 3.01 $ 1.34
Total intrinsic value of options exercised | $       $ 16.4 $ 9.6 $ 0.1
Total fair value of options vested | $       3.4 4.2 4.9
Stock options exchanged (in shares) 4,279,463          
Stock options issued from exchange (in shares) 1,728,795          
Shares paid for tax withholding for share-based compensation, cost | $       $ 11.0 $ 3.0 4.4
Treasury stock due to canceled RSA (in shares)       5,321,393 5,321,393  
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       1 year    
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       4 years    
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award expiration period       10 years    
Restricted Stock Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of restricted stock vested in period | $       $ 3.3 $ 3.6 $ 9.3
Shares paid for tax withholding for share-based compensation (in shares)       380,564 404,466 733,769
Shares paid for tax withholding for share-based compensation, cost | $       $ 3.8 $ 2.3 $ 1.8
Treasury stock purchases (in shares)       3,048,736    
Treasury stock due to canceled RSA (in shares)       1,208 72,259 834,440
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares paid for tax withholding for share-based compensation (in shares)       109,112 94,603 50,762
Shares paid for tax withholding for share-based compensation, cost | $       $ 1.1 $ 0.7 $ 0.2
Performance-Based Restricted Stock Units (PBRSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares that could vest (in shares)     9,209,263      
Performance-Based Restricted Stock Units (PBRSUs) | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares vesting if market-based conditions met, potential percentage of the number originally granted (up to)     0.00%      
Number of shares vesting if price targets met, potential percentage of the number originally granted (up to)     0.00%      
Performance-Based Restricted Stock Units (PBRSUs) | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares vesting if market-based conditions met, potential percentage of the number originally granted (up to)     350.00%      
Number of shares vesting if price targets met, potential percentage of the number originally granted (up to)     200.00%      
Amended and Restated 2010 Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of additional shares authorized (in shares)   17,000,000        
Stock Incentive Plan 2010            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Available for future grant (in shares)       7,463,122