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Summary of Activity Related to Other Intangible Assets, Net (Parenthetical)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Goodwill and Intangible Assets [Line Items]  
Weighted-average amortization period 3 years
2016 $ 2.0
2017 2.0
2018 1.9
2019 0.0
2020 0.0
Finite Lived Intangible Assets Net $ 5.9