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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Net operating revenues	$ 10.4	$ 10.9	$ 21.2	$ 22.1
Operating expenses	(6.0)	(5.8)	(12.1)	(12.1)
Income from continuing operations, net of tax	4.4	5.0	9.0	10.0
Net income	$ 4.4	$ 5.0	$ 9.0	$ 10.0

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