Pension Benefit Plans (Components Of Net Periodic Pension Costs) (Details) - Pension Benefit Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 32.7	$ 36.4
Interest cost	25.5	32.8
Expected return on plan assets	(42.4)	(40.2)
Amortization of prior service credit	(0.3)	(0.3)
Amortization of net loss	7.8	7.8
Curtailment and settlement gains recognized	(0.5)	(0.3)
Net periodic pension (benefit) cost	22.8	36.2
United States | Domestic Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	7.3	9.0
Interest cost	82.3	89.7
Expected return on plan assets	(130.5)	(132.6)
Amortization of prior service credit	0.0	0.0
Amortization of net loss	24.9	24.6
Curtailment and settlement gains recognized	0.0	(0.7)
Net periodic pension (benefit) cost	$ (16.0)	$ (10.0)