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Other Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Other assets    
Investments in affiliated companies $ 71.2 $ 62.6
Other investments 15.5 9.5
Marketable Securities 12.0 12.4
Deposits 8.4 9.3
Deferred financing fees 1.0 1.2
Other 4.4 2.5
Total other assets $ 112.5 $ 97.5