Acquisition and Discontinued Operations (Summary of Results of Operations Related to AFI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax expense	$ (5.9)	$ (14.7)	$ (5.4)	$ (16.6)
Net (loss) gain on disposal of discontinued business	$ 5.9	$ 14.7	$ 5.3	16.7
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)