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Share-based Compensation - Incentive Plans (Details) - shares
1 Months Ended 12 Months Ended 55 Months Ended
Jun. 13, 2013
Dec. 31, 2016
Sep. 30, 2015
Aug. 31, 2007
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted in the period (in shares)         4,283,000 303,000 1,447,000  
Employee Time Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period         1 year 4 months 24 days      
Employee Time Options | Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award requisite service period         5 years      
Employee Time Options | Tranche Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award requisite service period         3 years      
2007 Stock Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted (in shares)               0
2007 Stock Incentive Plan | Employee Time Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized for issuance (in shares)       9,232,000        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years        
Award vesting period       5 years        
2013 Long-Term Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for grant (in shares) 7,521,000              
Number of additional shares authorized (in shares)   3,884,000 1,219,000          
Options granted in the period (in shares)         4,038,000 254,000 1,073,000  
2013 Long-Term Incentive Plan | Stock Options, Stock Appreciation Rights, And Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Accelerated vesting, change in ownership percentage 50.00%              
Change In ownership, percentage of gross fair value of assets sold in 12 months period         80.00%      
2013 Long-Term Incentive Plan | Stock Options, Stock Appreciation Rights, And Restricted Stock Units | Wengen                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Accelerated vesting, change in ownership percentage 50.00%              
2013 Long-Term Incentive Plan | Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award catch up period 8 years              
2013 Long-Term Incentive Plan | Performance Shares | Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 3 years              
2013 Long-Term Incentive Plan | Performance Shares | Tranche Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 3 years              
2013 Long-Term Incentive Plan | Performance Shares | Tranche Three                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 3 years              
2013 Long-Term Incentive Plan | Employee Time Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years              
2013 Long-Term Incentive Plan | Employee Time Options | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 3 years              
2013 Long-Term Incentive Plan | Employee Time Options | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period 5 years              
2013 Long-Term Incentive Plan - Available Under the 2013 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for grant (in shares) 7,074,000              
2013 Long-Term Incentive Plan - Available Under the 2007 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for grant (in shares) 447,000