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Employee plans - Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized in the consolidated balance sheets consist of:      
Prepaid postretirement assets $ 148.3 $ 33.3 $ 45.1
Other accrued liabilities (18.5) (19.3)  
Long-term postretirement liabilities (2,004.4) (2,292.6)  
Pension Plans | U.S. Plans      
Change in projected benefit obligation      
Benefit obligation at beginning of year 4,972.0 5,231.4  
Service cost 0.0 0.0 0.0
Interest cost 211.3 231.3 224.1
Plan participants’ contributions 0.0 0.0  
Plan amendment 0.0 0.0  
Plan curtailment 0.0 0.0  
Actuarial loss (gain) 177.0 87.2  
Benefits paid (358.7) (577.9)  
Foreign currency translation adjustments 0.0 0.0  
Benefit obligation at end of year 5,001.6 4,972.0 5,231.4
Change in plan assets      
Fair value of plan assets at beginning of year 3,452.1 3,759.4  
Actual return on plan assets 424.0 211.8  
Employer contribution 61.0 58.8  
Plan participants’ contributions 0.0 0.0  
Benefits paid (358.7) (577.9)  
Foreign currency translation and other adjustments 0.0 0.0  
Fair value of plan assets at end of year 3,578.4 3,452.1 3,759.4
Funded status at end of year (1,423.2) (1,519.9)  
Amounts recognized in the consolidated balance sheets consist of:      
Prepaid postretirement assets 0.0 0.0  
Other accrued liabilities (6.8) (6.7)  
Long-term postretirement liabilities (1,416.4) (1,513.2)  
Total funded status (1,423.2) (1,519.9)  
Accumulated other comprehensive loss, net of tax      
Net loss 2,690.6 2,828.8  
Prior service credit (39.8) (42.4)  
Accumulated benefit obligation 5,001.6 4,972.0  
Pension Plans | International Plans      
Change in projected benefit obligation      
Benefit obligation at beginning of year 3,076.2 2,987.8  
Service cost 5.1 7.4 8.7
Interest cost 72.8 87.8 94.1
Plan participants’ contributions 1.9 2.3  
Plan amendment (52.5) 0.0  
Plan curtailment (2.2) (3.7)  
Actuarial loss (gain) (93.8) 502.2  
Benefits paid (117.1) (110.0)  
Foreign currency translation adjustments 299.3 (397.6)  
Benefit obligation at end of year 3,189.7 3,076.2 2,987.8
Change in plan assets      
Fair value of plan assets at beginning of year 2,429.7 2,496.8  
Actual return on plan assets 172.3 287.7  
Employer contribution 77.4 73.7  
Plan participants’ contributions 1.9 2.3  
Benefits paid (117.1) (110.0)  
Foreign currency translation and other adjustments 269.7 (320.8)  
Fair value of plan assets at end of year 2,833.9 2,429.7 2,496.8
Funded status at end of year (355.8) (646.5)  
Amounts recognized in the consolidated balance sheets consist of:      
Prepaid postretirement assets 147.4 31.9  
Other accrued liabilities (0.2) (0.2)  
Long-term postretirement liabilities (503.0) (678.2)  
Total funded status (355.8) (646.5)  
Accumulated other comprehensive loss, net of tax      
Net loss 1,067.8 1,144.7  
Prior service credit (69.8) (27.7)  
Accumulated benefit obligation 3,188.0 3,072.1  
Other Postretirement Benefit Plans      
Change in projected benefit obligation      
Benefit obligation at beginning of year 120.1 131.5  
Service cost 0.5 0.4 0.6
Interest cost 5.6 6.2 6.9
Plan participants’ contributions 3.5 3.8  
Plan amendment (7.4) (3.3)  
Actuarial loss (gain) (4.3) (1.4)  
Federal drug subsidy 0.3 1.4  
Benefits paid (15.7) (16.9)  
Foreign currency translation adjustments 0.6 (1.6)  
Benefit obligation at end of year 103.2 120.1 131.5
Change in plan assets      
Fair value of plan assets at beginning of year 7.9 7.7  
Actual return on plan assets (0.3) (0.3)  
Employer contribution 12.2 13.6  
Plan participants’ contributions 3.5 3.8  
Benefits paid (15.7) (16.9)  
Fair value of plan assets at end of year 7.6 7.9 $ 7.7
Funded status at end of year (95.6) (112.2)  
Amounts recognized in the consolidated balance sheets consist of:      
Prepaid postretirement assets 0.9 1.4  
Other accrued liabilities (11.5) (12.4)  
Long-term postretirement liabilities (85.0) (101.2)  
Total funded status (95.6) (112.2)  
Accumulated other comprehensive loss, net of tax      
Net loss 14.9 19.0  
Prior service credit $ (9.8) $ (3.2)