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Equity Incentive Plans and Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Apr. 23, 2015
Employee Stock [Member]          
Stock-Based Compensation          
Stock-based compensation $ 0.4 $ 0.3 $ 0.9 $ 0.8  
Shares available for grant          
Shares available, at the end of the period 1,089,649   1,089,649    
Stock-Based Incentive Compensation Plans          
Stock-Based Compensation          
Number of shares reserved under the Plans 35,400,000   35,400,000   4,000,000
Shares available for grant          
Shares available, at the beginning of the year     7,305,368    
Stock options granted (in shares)     (498,426)    
Stock options forfeited (in shares)     1,472,366    
Nonvested equity stock and stock units granted (in shares) [1],[2]     (3,553,590)    
Nonvested equity stock and stock units forfeited (in shares) [2]     714,375    
Shares available, at the end of the period 5,440,093   5,440,093    
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 $ 5.5 3.7 $ 10.8 6.8  
Potential Additional Performance Stock Units [Domain]          
Shares available for grant          
Nonvested equity stock and stock units granted (in shares) [1],[2]     266,847    
Performance Shares [Member] | Restricted Stock and Stock Units [Member]          
Stock-Based Compensation          
Stock-based compensation $ 1.0 $ 0.7 $ 1.9 $ 1.3  
[1] (2)Amount includes 266,847 shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 2017 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 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.