Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Components of Net Periodic Benefit Costs (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4.3	$ 7.0	$ 10.6
Interest cost	21.7	22.9	26.1
Expected return on plan assets	(37.9)	(40.4)	(34.3)
Other adjustments	0.1	0.0	1.3
Amortization of net prior service cost	0.0	(0.1)	0.0
Amortization of net actuarial loss	3.3	6.5	7.5
Net periodic (income) benefit cost	(8.5)	(4.1)	11.2
Cost (income) of settlement/curtailment	4.4	5.1	0.7
Total benefit (income) cost	(4.1)	1.0	11.9
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1	0.6
Interest cost	6.5	6.8	7.8
Expected return on plan assets	(8.7)	(9.8)	(10.0)
Other adjustments	0.1	0.0	1.3
Amortization of net prior service cost	0.0	0.0	0.0
Amortization of net actuarial loss	0.9	0.8	2.2
Net periodic (income) benefit cost	(1.1)	(2.1)	1.9
Cost (income) of settlement/curtailment	1.6	2.1	0.6
Total benefit (income) cost	0.5	0.0	2.5
International | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4.2	6.9	10.0
Interest cost	15.2	16.1	18.3
Expected return on plan assets	(29.2)	(30.6)	(24.3)
Other adjustments	0.0	0.0	0.0
Amortization of net prior service cost	0.0	(0.1)	0.0
Amortization of net actuarial loss	2.4	5.7	5.3
Net periodic (income) benefit cost	(7.4)	(2.0)	9.3
Cost (income) of settlement/curtailment	2.8	3.0	0.1
Total benefit (income) cost	$ (4.6)	$ 1.0	$ 9.4