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Employee plans - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) plan $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of unissued common stock available for grant under the plans (in shares) | shares	2,400,000
Share-based compensation expense	$ 13.2	$ 11.2	$ 9.5
Grants of stock option awards (in shares) | shares	0	0	11,000
Weighted-average fair value of grant (in dollars per share) | $ / shares			$ 4.53
Stock option awards outstanding (in shares) | shares	1,100,000
Weighted-average exercise price of outstanding stock option awards (in dollars per share) | $ / shares	$ 27.90
Matching contribution by the company as percentage of participants' contribution	50.00%
Percentage of eligible pay contributed by participants that will be matched	6.00%
Cost recognized for contribution plans	$ 11.1	$ 10.8	$ 10.7
Deferred compensation liability	11.6	13.4
International Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost recognized for contribution plans	21.3	18.5	19.0
Pension Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company in next fiscal year	105.6
Pension Plans | U.S. Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash pension settlement charge	0.0	0.0	0.0
Estimated cash contributions by the company in next fiscal year	$ 67.2
Pension Plans | International Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of defined benefit plans with cash lump-sum payments paid to certain plan participants | plan	2
Non-cash pension settlement charge	$ 6.4	0.0	0.0
Estimated cash contributions by the company in next fiscal year	38.4
Other Postretirement Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company in next fiscal year	8.0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	13.1	10.1	7.5
Aggregate weighted-average grant-date fair value of units granted	17.9	14.4	12.9
Total unrecognized compensation cost	$ 12.2
Unrecognized compensation cost, weighted-average recognition period	1 year 10 months 25 days
Aggregate weighted-average grant-date fair value of units vested	$ 10.4	7.4	3.5
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 0.1	$ 1.1	$ 2.0
Performance-Based Unit | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which will vest after achievement of goals (in shares) | shares	0
Performance-Based Unit | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which will vest after achievement of goals (in shares) | shares	2

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Defined Benefit Plan, Payments for Settlement, Number of Plans with Cash Lump-Sum Payments

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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