Discontinued Operations (Summary of Results of Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ (0.1)			$ (1.9)	$ (43.4)
Earnings (loss) from discontinued operations	0.3	$ (0.3)		2.0	42.5
DLW [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposal of discontinued business before income tax	0.2	(0.3)		0.1	(0.9)
Income tax expense	(0.1)		$ (43.4)	(1.9)	(43.4)
Earnings (loss) from discontinued operations	$ 0.3	$ (0.3)		$ 2.0	$ 42.5