Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 2.6	$ 2.5	$ 8.1	$ 7.8
Interest cost	2.4	2.4	7.2	7.5
Expected return on assets	(3.9)	(3.4)	(11.7)	(10.1)
Amortization of prior service credit	(0.5)	(0.4)	(1.6)	(1.5)
Recognized actuarial losses (gains)	0.2	0.3	1.0	1.6
Net periodic benefit cost	0.8	1.4	3.0	5.3
Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.2	0.7	1.4	3.2
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.6	0.7	1.6	2.1
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	2.6	2.5	8.1	7.8
Interest cost	2.3	2.4	7.0	7.3
Expected return on assets	(3.9)	(3.4)	(11.7)	(10.1)
Amortization of prior service credit	(0.3)	(0.3)	(1.1)	(1.0)
Recognized actuarial losses (gains)	0.9	1.2	2.8	3.6
Net periodic benefit cost	1.6	2.4	5.1	7.6
Pension Benefits [Member] | Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	1.0	1.7	3.5	5.5
Contributions by employer				20.0
Pension Benefits [Member] | Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	0.6	0.7	1.6	2.1
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.1	0.0	0.2	0.2
Amortization of prior service credit	(0.2)	(0.1)	(0.5)	(0.5)
Recognized actuarial losses (gains)	(0.7)	(0.9)	(1.8)	(2.0)
Net periodic benefit cost	(0.8)	(1.0)	(2.1)	(2.3)
Other Retirement Benefits [Member] | Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net periodic benefit cost	$ (0.8)	$ (1.0)	$ (2.1)	$ (2.3)