Net Periodic Cost (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Domestic Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	5.1	5.9	0.3
Expected return on plan assets	(6.2)	(6.6)	(7.6)
Settlement and curtailment losses (gains)	0.0	0.0	0.0
Amortization of:
Prior service cost (credit)	0.0	0.0	0.0
Net actuarial losses	1.5	1.3	6.5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 0.4	$ 0.6	$ (0.8)
Discount rate	4.20%	4.80%	4.15%
Expected return on plan assets	7.00%	7.00%	7.00%
Discount rate	3.70%	4.20%	4.80%
Foreign Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost
Service cost	$ 4.9	$ 6.7	$ 11.1
Interest cost	13.5	15.1	18.9
Expected return on plan assets	(17.7)	(18.7)	(20.6)
Settlement and curtailment losses (gains)	6.8	0.4	(0.2)
Amortization of:
Prior service cost (credit)	0.1	0.1	0.1
Net actuarial losses	5.5	4.2	4.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 13.1	$ 7.8	$ 13.4
Discount rate	2.52%	3.61%	3.41%
Rate of compensation increase	2.36%	3.18%	2.99%
Expected return on plan assets	4.66%	5.38%	5.01%
Discount rate	2.36%	2.52%	3.61%
Rate of compensation increase	2.37%	2.36%	3.25%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	1.3	1.5	1.5
Expected return on plan assets	0.0	0.0	0.0
Settlement and curtailment losses (gains)	0.0	0.0	0.0
Amortization of:
Prior service cost (credit)	(0.2)	(0.2)	(0.1)
Net actuarial losses	0.0	0.0	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1.1	$ 1.3	$ 1.4
Discount rate	4.05%	4.65%	4.00%
Discount rate	3.65%	4.05%	4.65%
Health care cost trend rate assumed for next year	6.50%	6.75%	7.00%
Year ultimate rate is reached	2024	2024	2024
Ultimate rate	5.00%	5.00%	5.00%

No definition available.

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- Definition

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

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

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

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

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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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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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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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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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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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- Definition

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 settlement and curtailment.

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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

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-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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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Year ultimate health care cost trend rate is expected to be reached, in CCYY format.

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