Income tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	$ 71.8	$ 82.6	$ 59.7
Foreign	28.0	31.2	30.9
State and local	8.0	11.3	5.9
Total current tax expense	107.8	125.1	96.5
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total deferred tax expense	14.2	(0.5)	2.0
Provision for income taxes	122.0	124.6	97.2
Net deferred tax liabilities	168.6	158.0
Dividend out of current earnings from foreign subsidiaries to U.S. parent company		170.0
Foreign Tax Credit Associated with Dividends from Foreign Subsidiaries		7.1
2013 Dividend Out Of Current Earnings From Brazilian Subsidiary to U.S. Parent Company			21.3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1.5	0.4	1.0
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			8.9
Foreign Tax Credit Associated with Dividend from Brazil			8.0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
U.S. income before income taxes	260.1	255.3	201.1
Non-U.S. income before income taxes	103.8	108.4	88.6
Income from continuing operations before income taxes	363.9	363.7	289.7
Components of Deferred Tax Assets [Abstract]
Accounts receivable, principally due to allowances for returns and doubtful accounts	4.4	5.5
Inventories, principally due to additional costs inventories for tax purposes	19.8	24.1
Employee compensation and benefits accrued for financial reporting purposes	92.1	88.1
Foreign net operating losses	21.7	22.8
Foreign tax credits	24.1	25.0
Other	12.0	13.4
Total deferred tax assets	174.1	178.9
Less valuation allowance	(42.0)	(47.9)
Total deferred tax assets after valuation allowance	132.1	131.0
Components of Deferred Tax Liabilities [Abstract]
Plant and equipment, principally due to differences in depreciation, capitalized interest, and capitalized overhead	123.1	116.9
Goodwill and intangible assets, principally due to differences in amortization	177.6	172.1
Total deferred tax liabilities	300.7	289.0
Deferred tax liabilities, net	168.6	158.0
Deferred Tax Assets, Net, Classification [Abstract]
Deferred tax assets (included in prepaid expense and other current assets)	0.0	61.0
Deferred tax liabilities	172.4	223.4
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed expected tax expense on income before taxes at federal statutory rate	127.4	127.3	101.4
Increase (Decrease) Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
State and local income taxes net of federal income tax benefit	5.6	6.8	4.9
Foreign tax rate differential	(7.5)	(7.4)	(4.2)
Manufacturing tax benefits	(6.7)	(7.5)	(5.8)
Other	3.2	5.4	0.9
Actual income tax expense	$ 122.0	$ 124.6	$ 97.2
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Increase (Decrease) Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
State and local income taxes net of federal income tax benefit	1.50%	1.90%	1.70%
Foreign tax rate differential	(2.10%)	(2.00%)	(1.40%)
Manufacturing tax benefits	(1.80%)	(2.10%)	(2.00%)
Other	0.90%	1.50%	0.30%
Effective tax rate	33.50%	34.30%	33.60%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 24.1	$ 21.4
Additions based on tax positions related to the current year	2.6	2.3
Additions for tax positions of prior years	11.5	3.2
Reductions for tax positions of prior years	(1.6)	(0.6)
Reductions due to a lapse of the statute of limitations	(4.7)	(1.7)
Settlements	(1.2)	(0.5)
Balance at end of year	30.7	24.1	$ 21.4
Operating loss carryforwards	69.9
Operating loss carryforwards subject to expiration	28.1
Foreign tax credit carryforward	24.1
Valuation allowance	42.0	47.9
Undistributed foreign subsidiaries earnings	257.6
Unrecognized tax benefits that would impact effective tax rate	30.7	24.1
Interest and penalties	11.8	6.1
Unrecognized Tax Benefits, Increase Resulting from Acquisition	6.8
Interest and penalties resulting from acquisitions	7.2
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	7.0
Continuing Operations [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	11.5	1.0	13.9
Foreign	2.1	(0.7)	(14.8)
State and local	0.6	(0.8)	1.6
Total deferred tax expense	14.2	(0.5)	$ 0.7
Deferred charges and other assets [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Net deferred tax liabilities	3.8	4.4
Components of Deferred Tax Liabilities [Abstract]
Deferred tax liabilities, net	$ 3.8	$ 4.4