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Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	$ 3,578.4	$ 3,452.1	$ 3,759.4
Total plan assets in fair value hierarchy	3,340.2	3,287.3
Plan assets measured using NAV as a practical expedient	238.2	164.8
Pension Plans | U.S. Plans | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,465.1	1,443.1
Pension Plans | U.S. Plans | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	584.4	517.9
Plan assets measured using NAV as a practical expedient	0.0	0.0
Pension Plans | U.S. Plans | U.S. Govt. Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	139.8	158.5
Pension Plans | U.S. Plans | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	830.6	812.4
Pension Plans | U.S. Plans | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	19.8	18.6
Pension Plans | U.S. Plans | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	113.5	156.2
Pension Plans | U.S. Plans | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	2.6	3.1
Pension Plans | U.S. Plans | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	105.1	104.6
Pension Plans | U.S. Plans | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	228.0	272.0
Pension Plans | U.S. Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	34.8	12.2
Pension Plans | U.S. Plans | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	58.1	107.2
Pension Plans | U.S. Plans | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(116.7)	(195.3)
Pension Plans | U.S. Plans | Private Real Estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	112.4	40.5
Pension Plans | U.S. Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	0.9	1.1
Pension Plans | U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,704.5	1,676.0
Pension Plans | U.S. Plans | Level 1 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,461.9	1,438.3
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	139.8	158.5
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	113.5	156.2
Pension Plans | U.S. Plans | Level 1 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	13.1	(1.1)
Pension Plans | U.S. Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	34.8	12.2
Pension Plans | U.S. Plans | Level 1 | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	58.1	107.2
Pension Plans | U.S. Plans | Level 1 | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(116.7)	(195.3)
Pension Plans | U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,635.7	1,611.3
Pension Plans | U.S. Plans | Level 2 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	3.2	4.8
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	584.4	517.9
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	830.6	812.4
Pension Plans | U.S. Plans | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(10.5)	4.2
Pension Plans | U.S. Plans | Level 2 | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	228.0	272.0
Pension Plans | U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.0	0.0
Pension Plans | U.S. Plans | Level 3 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.0	0.0
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	2,833.9	2,429.7	2,496.8
Total plan assets in fair value hierarchy	1,173.8	995.5
Plan assets measured using NAV as a practical expedient	1,660.1	1,434.2
Pension Plans | International Plans | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.0	0.0
Pension Plans | International Plans | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	84.0	76.0
Plan assets measured using NAV as a practical expedient	780.7	726.7
Pension Plans | International Plans | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	254.1	241.4
Pension Plans | International Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	135.8	116.2
Pension Plans | International Plans | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	267.5	242.8
Plan assets measured using NAV as a practical expedient	837.7	640.0
Pension Plans | International Plans | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1.4	1.6
Pension Plans | International Plans | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1.2	4.9
Pension Plans | International Plans | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	357.1	294.5
Plan assets measured using NAV as a practical expedient	25.2	25.8
Pension Plans | International Plans | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	29.2	6.7
Pension Plans | International Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	25.1	11.4
Pension Plans | International Plans | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	19.9
Pension Plans | International Plans | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(1.5)
Pension Plans | International Plans | Private Real Estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	16.5	41.7
Pension Plans | International Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	0.0	0.0
Pension Plans | International Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	46.5	13.1
Pension Plans | International Plans | Level 1 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.0	0.0
Pension Plans | International Plans | Level 1 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	2.6	0.5
Pension Plans | International Plans | Level 1 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.4	1.2
Pension Plans | International Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	25.1	11.4
Pension Plans | International Plans | Level 1 | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	19.9
Pension Plans | International Plans | Level 1 | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(1.5)
Pension Plans | International Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	991.5	866.2
Pension Plans | International Plans | Level 2 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.0	0.0
Pension Plans | International Plans | Level 2 | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	84.0	76.0
Pension Plans | International Plans | Level 2 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	251.5	240.9
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	267.5	242.8
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1.0	0.4
Pension Plans | International Plans | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1.2	4.9
Pension Plans | International Plans | Level 2 | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	357.1	294.5
Pension Plans | International Plans | Level 2 | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	29.2	6.7
Pension Plans | International Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	135.8	116.2
Pension Plans | International Plans | Level 3 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.0	0.0
Pension Plans | International Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	135.8	116.2	120.6
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	7.6	7.9	7.7
Other Postretirement Benefit Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total		7.9
Other Postretirement Benefit Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total		7.9
Other Postretirement Benefit Plans | U.S. Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	7.6
Other Postretirement Benefit Plans | U.S. Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	$ 7.6	$ 7.9	$ 7.7

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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