Equity Method Investments (Net Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 75.6	$ 97.6
Noncurrent assets	12.3	14.6
Total assets	87.9	112.2
Current liabilities	50.7	74.9
Noncurrent liabilities	2.6	2.6
Total liabilities	53.3	77.5
Net assets	$ 34.6	$ 34.7