Pension Benefit Plans (Disaggregation of Service Costs) (Details) - Pension benefit plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (31.4)	$ (32.3)	$ (32.0)
Nonoperating income (expense), net	15.2	37.0	32.9
Net periodic pension benefit (cost)	(16.2)	4.7	0.9
Cost of sales
Defined Benefit Plan Disclosure [Line Items]
Service cost	(6.1)	(11.4)	(8.2)
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (25.3)	$ (20.9)	$ (23.8)