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Discontinued Operations (Summary of Income From Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 1.7	$ 79.0	$ 19.4	$ 298.4
Operating expenses	5.6	72.4	38.8	324.0
Operating loss before income taxes	(3.9)	6.6	(19.4)	(25.6)
Income tax (expense) benefit	(2.1)	(11.7)	7.1	(23.2)
Loss on impairment, net	(17.3)	0.0	(24.5)	(796.8)
Gain (loss) on disposal of discontinued operations, net	0.0	14.3	3.2	34.4
Income (loss) from discontinued operations	$ (23.3)	$ 9.2	$ (33.6)	$ (811.2)

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Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of tax expense (benefit) attributable to income (loss) from operations classified as a discontinued operation. Excludes tax expense (benefit) for gain (loss) on disposal and for provision for gain (loss) until disposal.

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