Acquisition and Discontinued Operations (Summary of Results of Operations Related to AFI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax expense	$ 0.2	$ (0.1)	$ 0.5	$ (1.9)
Net (loss) gain on disposal of discontinued business	$ (0.2)	$ 0.3	$ (0.6)	2.0
AFI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net sales				284.4
Cost of goods sold				237.2
Gross profit				47.2
Selling, general and administrative expenses				50.5
Operating (loss)				(3.3)
Other non-operating expense, net				1.1
(Loss) from discontinued operations before income taxes				(4.4)
Income tax expense				0.1
Net (loss) gain on disposal of discontinued business				$ (4.5)