Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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	5.3	6.8	9.4
Expected return on assets	(4.9)	(5.7)	(9.0)
Amortization of prior service cost	0.0	0.0	0.0
Amortization of actuarial net loss (gain)	3.2	3.6	5.1
Curtailment gain recognized	0.0	0.0	0.0
Net periodic benefit cost	$ 3.6	$ 4.7	$ 5.5
Weighted average assumptions:
Discount rate (as a percent)	4.20%	4.50%	4.10%
Expected return on plan assets (as a percent)	4.70%	5.50%	5.80%
Rate of compensation increase (as a percent)	0.00%	0.00%	0.00%
Non-US Pension Plans
Components of periodic benefit costs
Service cost - benefits earned during the year	$ 1.9	$ 1.7	$ 2.6
Interest cost of projected benefit obligation	2.1	2.5	8.9
Expected return on assets	(1.5)	(1.8)	(7.4)
Amortization of prior service cost	0.1	0.1	0.1
Amortization of actuarial net loss (gain)	1.6	1.0	2.3
Curtailment gain recognized	0.0	0.0	0.0
Net periodic benefit cost	$ 4.2	$ 3.5	$ 6.5
Weighted average assumptions:
Discount rate (as a percent)	2.10%	2.90%	3.30%
Expected return on plan assets (as a percent)	3.40%	4.00%	3.60%
Rate of compensation increase (as a percent)	2.60%	2.40%	3.90%
Postretirement Health and Other
Components of periodic benefit costs
Service cost - benefits earned during the year	$ 0.3	$ 0.3	$ 0.4
Interest cost of projected benefit obligation	1.0	1.7	2.0
Expected return on assets	0.0	0.0	0.0
Amortization of prior service cost	(1.4)	0.0	0.0
Amortization of actuarial net loss (gain)	0.4	0.0	0.1
Curtailment gain recognized	0.0	0.0	0.0
Net periodic benefit cost	$ 0.3	$ 2.0	$ 2.5
Weighted average assumptions:
Discount rate (as a percent)	3.80%	4.20%	3.70%
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%	1.50%

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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