Pension Benefit Plans Pension Benefit Plans (Disaggregation of Service Costs) (Details) - Pension benefit plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (42.2)	$ (40.0)	$ (45.4)
Nonoperating income (expense), net	40.0	33.2	19.2
Net periodic pension benefit (cost)	(2.2)	(6.8)	(26.2)
Cost of sales
Defined Benefit Plan Disclosure [Line Items]
Service cost	(11.4)	(8.2)	(9.8)
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (30.8)	$ (31.8)	$ (35.6)