Pension and Other Retiree Benefits (Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - Pension $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 206.5	$ 200.1
Accumulated benefit obligation	205.4	198.3
Fair value of plan assets	162.1	150.5
International
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	675.3	326.9
Accumulated benefit obligation	662.8	320.4
Fair value of plan assets	$ 443.5	$ 284.2
Canada
Defined Benefit Plan Disclosure [Line Items]
Number of plans with plan assets in excess of projected benefit obligations	1

Number of plans with plan assets in excess of projected benefit obligations.

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+ References

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- Definition

Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920

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- Definition

Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

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- Definition

Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921

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