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Assets - Other Assets (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Cost Method Investment  
Change in additional investment $ 0.0
Carrying value of the investment 21.0
Deferred compensation plan assets 3.3
Deferred compensation plan liability $ 4.5
Maximum  
Cost Method Investment  
Percentage ownership of cost method investee 20.00%