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Investments In and Advances to Nonconsolidated Affiliates - Table 1 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Net operating revenues	$ 11.0	$ 10.8
Operating expenses	(7.6)	(6.3)
Income from continuing operations, net of tax	3.4	4.4
Net income	$ 3.4	$ 4.4

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