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Investments in Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]    
Revenues $ 74.5 $ 77.8
Costs 41.1 41.5
Income before income taxes $ 33.4 $ 36.3