Acquisition and Discontinued Operations (Summary of Results of Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax expense (benefit)	$ 0.3	$ (1.8)
Net (loss) gain on disposal of discontinued business	(0.4)	1.7
DLW and AFI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
(Loss) on disposal of discontinued business before income tax	(0.1)	(0.1)
Income tax expense (benefit)	0.3	(1.8)
Net (loss) gain on disposal of discontinued business	$ (0.4)	$ 1.7