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Commitments and Contingencies - Leases (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Commitments and Contingencies      
Number of leases that require rent to be paid based on contingent events | item 0    
Rent expense | $ $ 27.4 $ 25.9 $ 23.7