Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Components of net periodic benefit cost or (income):
Service cost	$ 2.0	$ 2.6	$ 4.0	$ 5.2
Interest cost	7.0	8.4	14.1	16.7
Expected return on plan assets	(12.6)	(11.5)	(25.2)	(23.1)
Amortization of net prior service cost	(0.1)	0.1	(0.1)	0.1
Amortization of net actuarial loss	2.8	2.6	5.6	5.4
Net periodic benefit cost (income)	(0.9)	2.2	(1.6)	4.3
Cost of settlement/curtailment	0.8	(0.3)	1.3	(0.2)
Total benefit cost (income)	(0.1)	1.9	(0.3)	4.1
U.S.
Components of net periodic benefit cost or (income):
Service cost	0.1	0.1	0.1	0.2
Interest cost	1.7	1.9	3.5	3.8
Expected return on plan assets	(2.4)	(2.5)	(4.9)	(5.0)
Amortization of net prior service cost	0.0	0.0	0.0	0.0
Amortization of net actuarial loss	0.2	0.5	0.4	1.0
Net periodic benefit cost (income)	(0.4)	0.0	(0.9)	0.0
Cost of settlement/curtailment	0.8	0.0	0.8	0.0
Total benefit cost (income)	0.4	0.0	(0.1)	0.0
International
Components of net periodic benefit cost or (income):
Service cost	1.9	2.5	3.9	5.0
Interest cost	5.3	6.5	10.6	12.9
Expected return on plan assets	(10.2)	(9.0)	(20.3)	(18.1)
Amortization of net prior service cost	(0.1)	0.1	(0.1)	0.1
Amortization of net actuarial loss	2.6	2.1	5.2	4.4
Net periodic benefit cost (income)	(0.5)	2.2	(0.7)	4.3
Cost of settlement/curtailment	0.0	(0.3)	0.5	(0.2)
Total benefit cost (income)	(0.5)	1.9	(0.2)	4.1
Other employee benefit plans
Components of net periodic benefit cost or (income):
Service cost	0.1	0.1	0.1	0.1
Interest cost	0.4	0.4	0.9	0.9
Amortization of net prior service cost	(0.3)	(0.3)	(0.8)	(0.7)
Amortization of net actuarial loss	(0.1)	0.0	(0.1)	0.0
Total benefit cost (income)	$ 0.1	$ 0.2	$ 0.1	$ 0.3