Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Measurement period adjustment	$ 4.4
Domestic	93.1	$ 96.7	$ 72.9
Foreign	111.0	94.2	97.4
Income from operations before tax and equity in earnings	204.1	190.9	170.3
Domestic [Abstract]
Taxes currently payable, Federal	(3.7)	46.0	18.7
Taxes currently payable, State and local	1.4	2.4	4.4
Deferred income taxes	11.1	(78.1)	(8.8)
Domestic tax provision (benefit)	8.8	(29.7)	14.3
Foreign [Abstract]
Taxes currently payable	21.3	21.1	23.2
Deferred income taxes	4.3	2.0	(2.2)
Foreign tax provision	25.6	23.1	21.0
Total tax provision (benefit)	$ 34.4	$ (6.6)	$ 35.3
Reconciliation of U. S. federal statutory tax rate to effective tax rate [Abstract]
U.S. statutory rate	21.00%	35.00%	35.00%
Depletion	(3.90%)	(6.70%)	(6.60%)
Difference between tax provided on foreign earnings and the US statutory rate	1.10%	(3.80%)	(6.40%)
Global Intangible Low-Tax Income (GILTI)	0.80%	0.00%	0.00%
Foreign Derived Intangible Income	(0.70%)	0.00%	0.00%
State and local taxes, net of federal tax benefit	1.90%	1.10%	1.10%
Tax credits and foreign dividends	(0.30%)	0.30%	0.60%
Change in valuation allowance	0.00%	(1.90%)	(1.10%)
Impact of uncertain tax positions	0.50%	0.40%	0.40%
Impact of officer's non-deductible compensation	0.80%	0.80%	0.10%
Manufacturing deduction	(0.00%)	(1.60%)	(2.00%)
Impact of U.S. Tax Reform	(2.20%)	(24.80%)	(0.00%)
Other	(2.10%)	(2.30%)	(0.40%)
Consolidated effective tax rate	16.90%	(3.50%)	20.70%
Deferred tax assets attributable to [Abstract]
Accrued liabilities	$ 22.2	$ 28.6
Net operating loss carry forwards	34.4	33.2
Pension and post-retirement benefits costs	33.8	40.4
Other	28.6	22.0
Valuation allowance	(22.0)	(21.4)
Total deferred tax assets	97.0	102.8
Deferred tax liabilities attributable to [Abstract]
Plant and equipment, principally due to differences in depreciation	182.8	161.6
Intangible assets	69.5	63.4
Other	15.2	11.6
Total deferred tax liabilities	267.5	236.6
Net deferred tax asset (liability)	(170.5)	(133.8)
Current and long-term portion of net deferred tax assets [Abstract]
Net deferred tax asset, long-term	26.3	25.6
Net deferred tax liability, long-term	196.8	159.4
Net deferred tax asset (liability), long-term	(170.5)	(133.8)
Operating loss carryforwards [Abstract]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	$ 34.4
Expiration period	20 years
Unrecognized tax benefits [Abstract]
Unrecognized tax benefits that would impact effective tax rate	$ 13.2
Unrecognized tax benefits [Roll forward]
Balance at beginning of the year	14.7	13.7
Increases related to current year positions	0.6	1.2
Increases related to new judgments	1.3	1.2
Decreases related to audit settlements and statute expirations	0.0	(1.4)
Balance at the end of the year	16.6	14.7	$ 13.7
Income Tax Penalties and Interest Expense [Abstract]
Unrecognized tax benefits, interest and penalties	0.9
Unrecognized tax benefits, accrued interest and penalties	2.5
Cash paid for income taxes [Abstract]
Net cash Income taxes paid	43.8	$ 47.7	$ 30.6
Undistributed earnings of foreign subsidiaries [Abstract]
Foreign subsidiaries' undistributed earnings	507.8
Deferred tax liabilities with respect to foreign withholding taxes or state taxes have been recognized	0.0
Finite lived tax loss carry forwards [Member]
Operating loss carryforwards [Abstract]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	17.1
Indefinite lived tax loss carry forwards [Member]
Operating loss carryforwards [Abstract]
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations	$ 17.3