Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 2.6	$ 2.8	$ 5.3	$ 5.6
Interest cost	2.5	2.7	5.1	5.4
Expected return on assets	(3.3)	(3.2)	(6.7)	(6.3)
Amortization of prior service credit	(0.6)	(0.3)	(1.1)	(0.7)
Recognized actuarial losses (gains)	0.8	0.8	1.3	1.6
Net periodic benefit cost	2.0	2.8	3.9	5.6
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	2.6	2.7	5.3	5.3
Interest cost	2.4	2.6	4.9	5.2
Expected return on assets	(3.3)	(3.2)	(6.7)	(6.3)
Amortization of prior service credit	(0.4)	(0.3)	(0.7)	(0.7)
Recognized actuarial losses (gains)	1.2	1.1	2.4	2.3
Net periodic benefit cost	2.5	2.9	5.2	5.8
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.0	0.1	0.0	0.3
Interest cost	0.1	0.1	0.2	0.2
Amortization of prior service credit	(0.2)	0.0	(0.4)	0.0
Recognized actuarial losses (gains)	(0.4)	(0.3)	(1.1)	(0.7)
Net periodic benefit cost	(0.5)	(0.1)	(1.3)	(0.2)
U.S. Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	1.8	2.3	3.8	4.6
Defined benefit plan, contributions by employer			20.0
International Pension Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.7	0.6	1.4	1.2
Foreign Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.7	0.6	1.4	1.2
Us Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	1.3	2.2	2.5	4.4
U.S. Other Retirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	$ (0.5)	$ (0.1)	$ (1.3)	$ (0.2)