Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined contribution retirement plan
Percentage that the employer contributes of employee contributions under 401(k) plan			100.00%
Maximum percentage of employee compensation match by employer to defined contribution plan			6.00%
Costs related to defined contribution retirement plan	$ 3.6	$ 3.3	$ 6.9	$ 6.1
United States
Net Periodic Benefit Cost
Defined Benefit Plan, Service Cost	4.0	4.9	7.9	9.7
Defined Benefit Plan, Interest Cost	9.5	10.3	19.1	20.6
Expected return on plan assets	(12.1)	(14.6)	(24.1)	(29.1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.1)	(0.1)	(0.3)	(0.3)
Net periodic benefit cost (income)	1.3	0.5	2.6	0.9
Foreign Plan [Member]
Net Periodic Benefit Cost
Defined Benefit Plan, Service Cost	2.1	2.5	4.3	4.9
Defined Benefit Plan, Interest Cost	1.4	1.2	2.7	2.5
Expected return on plan assets	(0.2)	(0.2)	(0.4)	(0.5)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0	0.0
Net periodic benefit cost (income)	$ 3.3	$ 3.5	$ 6.6	$ 6.9