Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Domestic	$ 54.8	$ 66.6	$ 56.9
Foreign	68.2	57.1	53.7
Income from continuing operations before provision for taxes and equity in earnings	123.0	123.7	110.6
Domestic [Abstract]
Taxes currently payable, Federal	28.1	13.7	14.9
Taxes currently payable, State and local	3.4	2.6	1.3
Deferred income taxes	(15.1)	2.5	3.2
Domestic tax provision	16.4	18.8	19.4
Foreign [Abstract]
Taxes currently payable	20.3	13.8	14.3
Deferred income taxes	(5.9)	1.9	(1.8)
Foreign tax provision	14.4	15.7	12.5
Total tax provision	30.8	34.5	31.9
Reconciliation of U. S. federal statutory tax rate to effective tax rate [Abstract]
U.S. statutory rate (in hundredths)	35.00%	35.00%	35.00%
Depletion (in hundredths)	(7.80%)	(3.60%)	(3.80%)
Difference between tax provided on foreign earnings and the US statutory rate (in hundredths)	(9.50%)	(3.60%)	(4.00%)
State and local taxes, net of Federal tax benefit (in hundredths)	1.00%	1.70%	1.50%
Tax credits and foreign dividends (in hundredths)	4.10%	(1.70%)	(0.10%)
Change in valuation allowance (in hundredths)	1.70%	0.30%	(1.10%)
Impact of uncertain tax positions (in hundredths)	0.40%	(0.60%)	0.90%
Impact of officer's non-deductible compensation (in hundredths)	2.70%	2.30%	2.10%
Manufacturing deduction (in hundredths)	(3.30%)	(0.90%)	(0.80%)
Other (in hundredths)	0.70%	(1.00%)	(0.90%)
Consolidated effective tax rate (in hundredths)	25.00%	27.90%	28.80%
Deferred tax assets attributable to: [Abstract]
Accrued liabilities	39.9	9.4
Net operating loss carry forwards	25.6	9.6
Pension and post-retirement benefits costs	57.1	21.6
Other	18.9	14.3
Valuation allowance	(21.7)	(5.9)
Total deferred tax assets	119.8	49.0
Deferred tax liabilities attributable to: [Abstract]
Plant and equipment, principally due to differences in depreciation	264.3	14.3
Intangible assets	89.3	13.3
Other	5.4	1.6
Total deferred tax liabilities	359.0	29.2
Net deferred tax asset (liability)	(239.2)	19.8
Current and long-term portion of net deferred tax assets [Abstract]
Net deferred tax asset (liability), current	19.6	4.0
Net deferred tax asset (liability), long-term	(258.8)	15.8
Net deferred tax asset (liability)	(239.2)	19.8
Operating Loss Carryforwards [Line Items]
Additional deferred tax liability corresponding to goodwill	322.3
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	15.3
Expiration period (in years)	20 years
Unrecognized tax benefits [Abstract]
Unrecognized tax benefits that would impact effective tax rate	2.5
Unrecognized tax benefits [Roll forward]
Balance at beginning of the year	3.9	4.8
Increases related to current year positions	0.6	0.6
Increases related to new judgments	1.0	0
Decreases related to audit settlements and statute expirations	(0.5)	(1.5)
Balance at the end of the year	5.0	3.9	4.8
Unrecognized tax benefits, net reversal of accrued interest and penalties	0.7
Unrecognized tax benefits, accrued interest and penalties	1.3
Cash paid for income taxes [Abstract]
Net cash Income taxes paid	5.7	25.5	21.5
Undistributed earnings of foreign subsidiaries [Abstract]
Foreign subsidiaries' undistributed earnings for which the company has not provided for withholding taxes	515.4
Estimated incremental taxes that may be incurred on foreign subsidiaries' undistributed earnings were the earnings to be repatriated	97.0
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	12.0
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	$ 3.3