Investments In and Advances to Nonconsolidated Affiliates - Table 1 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Net operating revenues	$ 9.9	$ 11.3	$ 31.0	$ 33.4
Operating expenses	(5.6)	(6.0)	(18.1)	(18.1)
Income from continuing operations, net of tax	4.3	5.2	12.9	15.2
Net income	$ 4.3	$ 5.2	$ 12.9	$ 15.2