Pension Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
NAV per share, investment redemption, notice period		90 days
Expense for all defined benefit and defined contributions pension plans		$ 187.0	$ 177.0	$ 177.0
Pension benefit plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service credits, before tax		7.0
Unrecognized net prior service credits, net of tax		5.0
Unrecognized actuarial losses, before tax		(919.0)
Unrecognized actuarial losses, net of tax		(695.0)
Future amortization of prior service cost (credit)		0.7
Future amortization of prior service cost (credit), net of tax		0.5
Future amortization of gain (loss)		(30.0)
Future amortization of gain (loss), net of tax		$ (23.0)
Non-U.S. plan | Pension benefit plans
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions		3.90%	3.90%
Employer contributions		$ 52.4	$ 44.7
Expected employer contributions within the next year		$ 50.0
Non-U.S. plan | Pension benefit plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions		1.00%	1.00%
Non-U.S. plan | Pension benefit plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions		5.80%	5.80%
Non-U.S. plan | Pension benefit plans | Weighted average
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions		3.90%	3.90%
United States | Domestic plan | Pension benefit plans
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions		7.00%	7.00%
Employer contributions		$ 55.1	$ 53.2
Expected employer contributions within the next year		$ 10.0
United States | Domestic plan | Pension benefit plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage		60.00%
United States | Domestic plan | Pension benefit plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage		70.00%
Scenario, forecast | United States | Domestic plan | Pension benefit plans
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of return on asset assumptions	7.00%
ASU No. 2017-07
Defined Benefit Plan Disclosure [Line Items]
Effect of change in accounting principle on operating profit			(31.0)	(16.0)
Effect of change in accounting principle on net other income			31.0	16.0
ASU No. 2017-07 | Pension benefit plans
Defined Benefit Plan Disclosure [Line Items]
Effect of change in accounting principle on operating profit			(33.0)	(19.0)
Effect of change in accounting principle on net other income			$ 33.0	$ 19.0