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Summary of Significant Accounting Policies, Stock-Based Compensation (Details) - General and Administrative Expense [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-Based Compensation [Abstract]      
Compensation expense related to equity compensation plans $ 7.4 $ 17.5 $ 32.6
Reversal of compensation expense for certain performance based awards no longer expected to vest $ 7.6 $ 4.7