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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |  |  |
Provisional income tax benefit | $ (47.3) |  |  |  |
Domestic |  |  | $ 96.7 | $ 72.9 | $ 32.6
Foreign |  |  | 94.2 | 97.4 | 100.0
Income from operations before provision for taxes and equity in earnings |  |  | 190.9 | 170.3 | 132.6
Domestic [Abstract] |  |  |  |  |
Taxes currently payable, Federal |  |  | 46.0 | 18.7 | 1.4
Taxes currently payable, State and local |  |  | 2.4 | 4.4 | 1.2
Deferred income taxes |  |  | (78.1) | (8.8) | (3.2)
Domestic tax provision (benefit) |  |  | (29.7) | 14.3 | (0.6)
Foreign [Abstract] |  |  |  |  |
Taxes currently payable |  |  | 21.1 | 23.2 | 22.7
Deferred income taxes |  |  | 2.0 | (2.2) | 0.7
Foreign tax provision |  |  | 23.1 | 21.0 | 23.4
Total tax provision (benefit) |  |  | $ (6.6) | $ 35.3 | $ 22.8
Reconciliation of U. S. federal statutory tax rate to effective tax rate [Abstract] |  |  |  |  |
U.S. statutory rate |  |  | 35.00% | 35.00% | 35.00%
Depletion |  |  | (6.70%) | (6.60%) | (8.40%)
Difference between tax provided on foreign earnings and the US statutory rate |  |  | (3.80%) | (6.40%) | (8.30%)
State and local taxes, net of federal tax benefit |  |  | 1.10% | 1.10% | 0.30%
Tax credits and foreign dividends |  |  | 0.30% | 0.60% | (0.50%)
Change in valuation allowance |  |  | (1.90%) | (1.10%) | (0.90%)
Impact of uncertain tax positions |  |  | 0.40% | 0.40% | (0.10%)
Impact of officer's non-deductible compensation |  |  | 0.80% | 0.10% | 2.90%
Manufacturing deduction |  |  | (1.60%) | (2.00%) | (2.00%)
Impact of US Tax Reform |  |  | (24.80%) | (0.00%) | (0.00%)
Other |  |  | (2.30%) | (0.40%) | (0.80%)
Consolidated effective tax rate |  |  | (3.50%) | 20.70% | 17.20%
Deferred tax assets attributable to [Abstract] |  |  |  |  |
Accrued liabilities | 28.6 |  | $ 28.6 | $ 49.7 |
Net operating loss carry forwards | 33.2 |  | 33.2 | 34.6 |
Pension and post-retirement benefits costs | 40.4 |  | 40.4 | 55.4 |
Other | 22.0 |  | 22.0 | 35.0 |
Valuation allowance | (21.4) |  | (21.4) | (24.8) |
Total deferred tax assets | 102.8 |  | 102.8 | 149.9 |
Deferred tax liabilities attributable to [Abstract] |  |  |  |  |
Plant and equipment, principally due to differences in depreciation | 161.6 |  | 161.6 | 251.3 |
Intangible assets | 63.4 |  | 63.4 | 96.3 |
Other | 11.6 |  | 11.6 | 14.0 |
Total deferred tax liabilities | 236.6 |  | 236.6 | 361.6 |
Net deferred tax asset (liability) | (133.8) |  | (133.8) | (211.7) |
Current and long-term portion of net deferred tax assets [Abstract] |  |  |  |  |
Net deferred tax asset, long-term | 25.6 |  | 25.6 | 27.1 |
Net deferred tax liability, long-term | 159.4 |  | 159.4 | 238.8 |
Net deferred tax asset (liability), long-term | (133.8) |  | (133.8) | (211.7) |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations | 33.2 |  | $ 33.2 |  |
Expiration period |  |  | 20 years |  |
Unrecognized tax benefits [Abstract] |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | 11.9 |  | $ 11.9 |  |
Unrecognized tax benefits [Roll forward] |  |  |  |  |
Balance at beginning of the year |  | $ 14.7 | 13.7 | 4.0 |
Increases related to current year positions |  |  | 1.2 | 8.8 |
Increases related to new judgments |  |  | 1.2 | 0.9 |
Decreases related to audit settlements and statute expirations |  |  | (1.4) | 0.0 |
Balance at the end of the year | 14.7 |  | 14.7 | 13.7 | $ 4.0
Income Tax Penalties and Interest Expense [Abstract] |  |  |  |  |
Unrecognized tax benefits, net reversal of accrued interest and penalties |  |  | 0.4 |  |
Unrecognized tax benefits, accrued interest and penalties | 1.7 |  | 1.7 |  |
Cash paid for income taxes [Abstract] |  |  |  |  |
Net cash Income taxes paid |  |  | 47.7 | $ 30.6 | $ 43.8
Undistributed earnings of foreign subsidiaries [Abstract] |  |  |  |  |
Foreign subsidiaries' undistributed earnings | 531.2 |  | 531.2 |  |
Deferred tax liabilities with respect to foreign withholding taxes or state taxes have been recognized | 0.0 |  | 0.0 |  |
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 | 15.5 |  | 15.5 |  |
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 | $ 17.7 |  | $ 17.7 |  |
Plan [Member] |  |  |  |  |
Reconciliation of U. S. federal statutory tax rate to effective tax rate [Abstract] |  |  |  |  |
U.S. statutory rate |  | 21.00% |  |  |

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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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