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STOCK-BASED COMPENSATION. (Future stock-based compensation expense) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]  
First quarter 2016 $ 31.6
Second quarter 2016 30.5
Third quarter 2016 30.5
Fourth quarter 2016 26.8
Total 2016 119.4
2017 through 2021 128.1
Total $ 247.5