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Affiliated Companies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]        
Purchase of cost-method investment $ 8.4 $ 8.4 $ 0.0  
Carrying amount, equity-method investments 64.3 64.3   $ 56.3
Carrying amount, cost-method investments $ 13.4 $ 13.4   $ 5.0