Defined Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
U.S.
Service cost	$ 1.7	$ 1.9
Interest cost	1.7	2.4
Expected return on plan assets	(3.5)	(3.7)
Administrative costs and other	0.3	0.5
Prior service costs	0.1	0.1
Plan net actuarial losses	0.9	1.0
Net periodic pension benefit cost (income)	1.2	2.2
Non-U.S.
Service cost	0.6	0.5
Interest cost	1.3	1.7
Expected return on plan assets	(3.5)	(3.3)
Administrative costs and other	0.5	0.4
Plan net actuarial losses	0.4	0.4
Net periodic pension benefit cost (income)	$ (0.7)	$ (0.3)