Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. Pension Plans
Components of periodic benefit costs
Service cost - benefits earned during the year	$ 0.0	$ 0.0
Interest cost of projected benefit obligation	$ 5.2	$ 5.3
Weighted average assumptions:
Expected return on plan assets (as a percent)	5.30%	4.70%
Non-US Pension Plans
Components of periodic benefit costs
Service cost - benefits earned during the year	$ 1.8	$ 1.9
Interest cost of projected benefit obligation	$ 2.1	$ 2.1
Weighted average assumptions:
Expected return on plan assets (as a percent)	2.70%	3.40%
Pension Plans | U.S. Pension Plans
Components of periodic benefit costs
Service cost - benefits earned during the year	$ 0.0	$ 0.0	$ 0.0
Interest cost of projected benefit obligation	5.2	5.3	6.8
Expected return on assets	(5.7)	(4.9)	(5.7)
Amortization of prior service cost	0.0	0.0	0.0
Amortization of actuarial net loss (gain)	2.9	3.2	3.6
Pension settlement charge	4.5	0.0	0.0
Net periodic benefit cost	$ 6.9	$ 3.6	$ 4.7
Weighted average assumptions:
Discount rate (as a percent)	3.80%	4.20%	4.50%
Expected return on plan assets (as a percent)	5.30%	4.70%	5.50%
Rate of compensation increase (as a percent)	0.00%	0.00%	0.00%
Pension Plans | Non-US Pension Plans
Components of periodic benefit costs
Service cost - benefits earned during the year	$ 1.8	$ 1.9	$ 1.7
Interest cost of projected benefit obligation	2.1	2.1	2.5
Expected return on assets	(1.4)	(1.5)	(1.8)
Amortization of prior service cost	0.1	0.1	0.1
Amortization of actuarial net loss (gain)	1.3	1.6	1.0
Pension settlement charge	0.0	0.0	0.0
Net periodic benefit cost	$ 3.9	$ 4.2	$ 3.5
Weighted average assumptions:
Discount rate (as a percent)	2.20%	2.10%	2.90%
Expected return on plan assets (as a percent)	2.70%	3.40%	4.00%
Rate of compensation increase (as a percent)	3.50%	2.60%	2.40%
Postretirement Medical and Other
Components of periodic benefit costs
Service cost - benefits earned during the year	$ 0.2	$ 0.3	$ 0.3
Interest cost of projected benefit obligation	0.8	1.0	1.7
Expected return on assets	0.0	0.0	0.0
Amortization of prior service cost	(2.8)	(1.4)	0.0
Amortization of actuarial net loss (gain)	0.8	0.4	0.0
Pension settlement charge	0.0	0.0	0.0
Net periodic benefit cost	$ (1.0)	$ 0.3	$ 2.0
Weighted average assumptions:
Discount rate (as a percent)	3.30%	3.80%	4.20%
Expected return on plan assets (as a percent)	0.00%	0.00%	0.00%
Rate of compensation increase (as a percent)	0.00%	0.00%	0.00%