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Investments In and Advances to Nonconsolidated Affiliates - Table 1 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Net operating revenues	$ 10.5	$ 10.4	$ 21.5	$ 21.2
Operating expenses	(5.6)	(6.0)	(13.2)	(12.1)
Income from continuing operations, net of tax	4.9	4.4	8.3	9.0
Net income	$ 4.9	$ 4.4	$ 8.3	$ 9.0

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