Income Taxes (Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
United States	$ 30.2	$ 54.1	$ 10.8
Outside United States	373.7	298.3	189.8
Total current	403.9	352.4	200.6
Deferred:
United States	71.4	(7.2)	46.6
Outside United States	70.2	(164.9)	(110.7)
Total deferred	141.6	(172.1)	(64.1)
Provision for income taxes	$ 545.5	$ 180.3	$ 136.5