Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Domestic	$ 72.9	$ 32.6	$ 54.8
Foreign	97.4	100.0	68.2
Income from continuing operations before provision for taxes and equity in earnings	170.3	132.6	123.0
Domestic [Abstract]
Taxes currently payable, Federal	18.7	1.4	28.1
Taxes currently payable, State and local	4.4	1.2	3.4
Deferred income taxes	(8.8)	(3.2)	(15.1)
Domestic tax provision	14.3	(0.6)	16.4
Foreign [Abstract]
Taxes currently payable	23.2	22.7	20.3
Deferred income taxes	(2.2)	0.7	(5.9)
Foreign tax provision	21.0	23.4	14.4
Total tax provision	$ 35.3	$ 22.8	$ 30.8
Reconciliation of U. S. federal statutory tax rate to effective tax rate [Abstract]
U.S. statutory rate	35.00%	35.00%	35.00%
Depletion	(6.60%)	(8.40%)	(7.80%)
Difference between tax provided on foreign earnings and the US statutory rate	(6.40%)	(8.30%)	(9.50%)
State and local taxes, net of federal tax benefit	1.10%	0.30%	1.00%
Tax credits and foreign dividends	0.60%	(0.50%)	4.10%
Change in valuation allowance	(1.10%)	(0.90%)	1.70%
Impact of uncertain tax positions	0.40%	(0.10%)	0.40%
Impact of officer's non-deductible compensation	0.10%	2.90%	2.70%
Manufacturing deduction	(2.00%)	(2.00%)	(3.30%)
Other	(0.40%)	(0.80%)	0.70%
Consolidated effective tax rate	20.70%	17.20%	25.00%
Deferred tax assets attributable to [Abstract]
Accrued liabilities	$ 49.7	$ 36.1
Net operating loss carry forwards	34.6	37.6
Pension and post-retirement benefits costs	55.4	55.0
Other	35.0	29.1
Valuation allowance	(24.8)	(28.8)
Total deferred tax assets	149.9	129.0
Deferred tax liabilities attributable to [Abstract]
Plant and equipment, principally due to differences in depreciation	251.3	247.2
Intangible assets	96.3	98.7
Other	14.0	4.5
Total deferred tax liabilities	361.6	350.4
Net deferred tax asset (liability)	(211.7)	(221.4)
Current and long-term portion of net deferred tax assets [Abstract]
Net deferred tax asset, long-term	27.1	30.6
Net deferred tax liability, long-term	238.8	252.0
Net deferred tax asset (liability), long-term	(211.7)	(221.4)
Operating Loss Carryforwards [Line Items]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	$ 34.6
Expiration period	20 years
Unrecognized tax benefits [Abstract]
Unrecognized tax benefits that would impact effective tax rate	$ 9.5
Unrecognized tax benefits [Roll forward]
Balance at beginning of the year	4.0	5.0
Increases related to current year positions	8.8	0.5
Increases related to new judgments	0.9	0.8
Decreases related to audit settlements and statute expirations	0.0	(2.3)
Balance at the end of the year	13.7	4.0	$ 5.0
Income Tax Penalties and Interest Expense [Abstract]
Unrecognized tax benefits, net reversal of accrued interest and penalties	0.3
Unrecognized tax benefits, accrued interest and penalties	1.2
Cash paid for income taxes [Abstract]
Net cash Income taxes paid	30.6	$ 43.8	$ 5.7
Undistributed earnings of foreign subsidiaries [Abstract]
Foreign subsidiaries' undistributed earnings for which the company has not provided for withholding taxes	560.3
Estimated incremental taxes that may be incurred on foreign subsidiaries' undistributed earnings were the earnings to be repatriated	89.7
Finite lived tax loss carry forwards [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	17.5
Indefinite lived tax loss carry forwards [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	$ 17.1