Acquisition and Discontinued Operations (Summary of Carrying Amount of Major Classes of Assets and Liabilities Related to EMEA and Pacific Rim Businesses) (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Pre-tax impairment charge	$ 17.7	$ 74.0