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Share-Based Compensation - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 7.4 $ 5.7
Share-based compensation, capitalized 0.6 $ 1.4
Accelerated vesting compensation cost 5.3  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to unvested awards $ 10.0  
Unrecognized compensation cost, period of recognition 1 year 11 months 16 days  
Accelerated vesting (in shares) 1.3  
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
Accelerated vesting (in shares) 1.8  
Company Management | Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Accelerated vesting (in shares) 1.3