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Restructuring Charges - Activity and Reserve Balance for Restructuring Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 4.5	$ 4.1
Restructuring charges	5.8	13.2
Currency translation and other adjustments	(0.1)	(0.6)
Cash payments / utilization	(2.1)	(12.2)
Restructuring reserve, ending balance	8.1	4.5
Americas
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.5	0.5
Restructuring charges	0.0	2.3
Currency translation and other adjustments	0.0	(0.3)
Cash payments / utilization	(0.1)	(2.0)
Restructuring reserve, ending balance	0.4	0.5
International
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	4.0	3.6
Restructuring charges	5.7	5.6
Currency translation and other adjustments	(0.1)	(0.3)
Cash payments / utilization	(1.9)	(4.9)
Restructuring reserve, ending balance	7.7	4.0
Corporate
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.0	0.0
Restructuring charges	0.1	5.3
Currency translation and other adjustments	0.0	0.0
Cash payments / utilization	(0.1)	(5.3)
Restructuring reserve, ending balance	$ 0.0	$ 0.0

X

- Definition

Restructuring Charges before Adjustments - Restructuring charges before any adjustments to the accrual.

+ References

No definition available.

+ Details

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X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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X

- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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