Pension Plans and Other Postretirement Benefit Plans - Pension Plans and Other Postretirement Benefit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Funded status of fully funded, underfunded, and unfunded pension plans:
Overfunded defined benefit pension plans	$ 9.2		$ 9.2		$ 8.5
Unfunded defined benefit pension plans	520.5		520.5		519.8
Pension liabilities included in other current liabilities	14.9		14.9		14.8
Net funded status	(526.2)		(526.2)		(526.1)
Underfunded Plan
Funded status of fully funded, underfunded, and unfunded pension plans:
Unfunded defined benefit pension plans	84.0		84.0		85.2
Defined Benefit Plan, Unfunded Plan [Member]
Funded status of fully funded, underfunded, and unfunded pension plans:
Unfunded defined benefit pension plans	436.5		436.5		$ 434.6
Foreign Plan [Member]
Funded status of fully funded, underfunded, and unfunded pension plans:
Defined Benefit Plan, Service Cost	2.7	$ 2.1	5.4	$ 4.3
Defined Benefit Plan, Interest Cost	1.0	1.4	2.0	2.7
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(0.2)	(0.2)	(0.5)	(0.4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	3.5	3.3	6.9	6.6
United States
Funded status of fully funded, underfunded, and unfunded pension plans:
Defined Benefit Plan, Service Cost	4.7	4.0	9.4	7.9
Defined Benefit Plan, Interest Cost	7.5	9.5	15.1	19.1
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(12.1)	(12.1)	(24.1)	(24.1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.1)	(0.1)	(0.3)	(0.3)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 0.0	$ 1.3	$ 0.1	$ 2.6