Retirement and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
U.S. Defined Benefit Plans
Components of the net periodic cost for retirement and postretirement benefits
Service cost	$ 5.4	$ 5.9	$ 11.3	$ 12.1
Interest cost	4.7	4.2	9.5	8.5
Expected return on plan assets	(5.9)	(6.0)	(12.0)	(12.1)
Amortization of prior service cost	0.1	0.1	0.2	0.2
Amortization of unrecognized net loss (gain)	1.3	2.3	2.5	4.6
Net periodic cost recognized	5.6	6.5	11.5	13.3
Non-U.S. Defined Benefit Plans
Components of the net periodic cost for retirement and postretirement benefits
Service cost	1.7	2.0	3.5	4.2
Interest cost	3.0	2.9	5.9	6.2
Expected return on plan assets	(2.6)	(3.0)	(5.3)	(6.0)
Amortization of prior service cost	0.0	0.0	0.0	0.0
Amortization of unrecognized net loss (gain)	1.1	1.3	2.4	2.6
Net periodic cost recognized	3.2	3.2	6.5	7.0
Postretirement Medical Benefits
Components of the net periodic cost for retirement and postretirement benefits
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.3	0.3	0.6	0.6
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost	0.1	0.1	0.1	0.1
Amortization of unrecognized net loss (gain)	(0.1)	(0.2)	(0.2)	(0.3)
Net periodic cost recognized	$ 0.3	$ 0.2	$ 0.5	$ 0.4