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Commitments and Contingencies - Leases (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
item
Sep. 30, 2015
USD ($)
Commitments and Contingencies    
Number of leases that require rent to be paid based on contingent events | item 0  
Rent expense | $ $ 20.1 $ 19.3