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Equity Incentive Plans and Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Apr. 23, 2015
Employee Stock [Member]          
Stock-Based Compensation          
Stock-based compensation $ 0.3 $ 0.4 $ 0.8 $ 0.8  
Shares available for grant          
Shares available, at the end of the period 1,659,651   1,659,651    
Stock-Based Incentive Compensation Plans          
Stock-Based Compensation          
Number of shares reserved under the 2006 Purchase Plan 35,400,000   35,400,000   4,000,000
Shares available for grant          
Shares available, at the beginning of the year     11,173,545    
Stock options granted (in shares)     (440,000)    
Stock options forfeited (in shares)     773,912    
Stock options expired under former plans (in shares)     (412,467)    
Nonvested equity stock and stock units granted (in shares) [1],[2]     (3,336,963)    
Nonvested equity stock and stock units forfeited (in shares) [2]     636,828    
Shares available, at the end of the period 8,394,855   8,394,855    
Conversion factor used to calculate the decrease in the number of shares available for grant resulting from the grant of restricted stock awards 1.5   1.5    
Conversion factor used to calculate the increase in the number of shares available for grant resulting from the forfeiture of restricted stock awards 1.5   1.5    
Restricted Stock and Stock Units [Member]          
Stock-Based Compensation          
Stock-based compensation $ 3.7 1.7 $ 6.8 2.9  
Potential Additional Performance Stock Units [Domain]          
Shares available for grant          
Nonvested equity stock and stock units granted (in shares) [1],[2]     300,003    
Performance Shares [Member] | Restricted Stock and Stock Units [Member]          
Stock-Based Compensation          
Stock-based compensation $ 0.7 $ 0.3 $ 1.3 $ 0.5  
[1] (2)Amount includes 300,003 shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 2016 and discussed under the section titled "Nonvested Equity Stock and Stock Units" below.
[2] For purposes of determining the number of shares available for grant under the 2015 Plan (and previously the 2006 Plan) against the maximum number of shares authorized, each share of restricted stock granted reduces the number of shares available for grant by 1.5 shares and each share of restricted stock forfeited increases shares available for grant by 1.5 shares.