Accounting Policies (Equity Method Investments) (Details) - USD ($) $ in Millions		12 Months Ended
	Mar. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Entity Information [Line Items]
Reclassification of foreign currency translation gains to net income			$ (10.4)
Equity Method Investment Held For Sale Price		$ 16.3
Proceeds from disposal of equity method investment, net	$ 16.3	0.0	14.6	$ 0.0
Equity Method Investment, Transaction Fee		1.7
Equity Method Investment, Amount Sold		22.7
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		5.2	$ 1.3	$ (12.0)
Gain (Loss) on Sale of Equity Investments		2.3
JHJ international Transportation Co. [Member]
Entity Information [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		$ 10.4