Discontinued Operations (Summary of Results of Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
(Loss) from discontinued operations before income tax		$ 0.1	$ (0.2)	$ (17.0)
Net gain (loss) from discontinued operations		10.8	67.6	(15.3)
Loss on disposal of discontinued business, tax (benefit)		(15.2)	(41.8)	(2.5)
(Loss) earnings from discontinued operations		15.3	41.6	(14.5)
DLW [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
(Loss) from discontinued operations before income tax				(23.7)
Net gain (loss) from discontinued operations				(23.7)
Loss on disposal of discontinued business, tax (benefit)	$ (43.4)
DLW and AFI [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		0.1	(0.8)	(13.5)
Loss on disposal of discontinued business, tax (benefit)		(15.2)	(42.0)	(1.2)
(Loss) earnings from discontinued operations		$ 15.3	41.2	(12.3)
AIP [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			0.6	(3.5)
Loss on disposal of discontinued business, tax (benefit)			0.2	(1.3)
(Loss) earnings from discontinued operations			$ 0.4	$ (2.2)