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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |  |
Measurement period adjustment |  |  | $ 4.4
Income from operations before provision for taxes [Abstract] |  |  |
Domestic | $ 21.4 | $ 46.9 | 93.1
Foreign | 116.6 | 110.4 | 111.0
Income from operations before tax and equity in earnings | 138.0 | 157.3 | 204.1
Domestic [Abstract] |  |  |
Taxes currently payable, Federal | (7.1) | (3.3) | (3.7)
Taxes currently payable, State and local | 0.2 | 0.8 | 1.4
Deferred income taxes | 2.2 | (6.6) | 11.1
Domestic tax provision (benefit) | (4.7) | (9.1) | 8.8
Foreign [Abstract] |  |  |
Taxes currently payable | 34.0 | 26.7 | 21.3
Deferred income taxes | (4.9) | 5.2 | 4.3
Foreign tax provision | 29.1 | 31.9 | 25.6
Total tax provision (benefit) | $ 24.4 | $ 22.8 | $ 34.4
Reconciliation of U.S. federal statutory tax rate to effective tax rate [Abstract] |  |  |
U.S. statutory rate | 21.00% | 21.00% | 21.00%
Depletion | (6.20%) | (5.00%) | (3.90%)
Difference between tax provided on foreign earnings and the U.S. statutory rate | 3.30% | 3.80% | 1.10%
Global Intangible Low-Tax Income (GILTI) | 0.40% | 0.00% | 0.80%
Foreign Derived Intangible Income | (1.00%) | (0.80%) | (0.70%)
State and local taxes, net of federal tax benefit | 0.00% | 0.20% | 1.90%
Tax credits and foreign dividends | (0.60%) | (0.70%) | (0.30%)
Change in valuation allowance | 0.00% | 1.00% | 0.00%
Impact of uncertain tax positions | (0.20%) | (5.00%) | 0.50%
Impact of officer's non-deductible compensation | 1.00% | 0.80% | 0.80%
Impact of U.S. Tax Reform | 0.00% | (1.10%) | (2.20%)
Other | 0.00% | 0.30% | (2.10%)
Consolidated effective tax rate | 17.70% | 14.50% | 16.90%
Deferred tax assets attributable to [Abstract] |  |  |
Accrued liabilities | $ 29.8 | $ 29.7 |
Net operating loss carry forwards | 31.1 | 33.9 |
Pension and post-retirement benefits costs | 46.3 | 39.0 |
Other | 28.2 | 31.4 |
Valuation allowance | (20.9) | (23.8) |
Total deferred tax assets | 114.5 | 110.2 |
Deferred tax liabilities attributable to [Abstract] |  |  |
Plant and equipment, principally due to differences in depreciation | 169.5 | 181.3 |
Intangible assets | 69.5 | 69.5 |
Other | 13.9 | 17.0 |
Total deferred tax liabilities | 252.9 | 267.8 |
Net deferred tax asset (liability), long-term | (138.4) | (157.6) |
Current and long-term portion of net deferred tax assets [Abstract] |  |  |
Net deferred tax asset, long-term | 25.3 | 23.0 |
Net deferred tax liability, long-term | 163.7 | 180.6 |
Net deferred tax asset (liability), long-term | (138.4) | (157.6) |
Operating loss carryforwards [Abstract] |  |  |
Deferred tax assets arising from tax loss carry forwards which will be realized through future operations | 31.1 |  |
Unrecognized tax benefits [Abstract] |  |  |
Unrecognized tax benefits that would impact effective tax rate | 5.1 |  |
Unrecognized tax benefits [Roll forward] |  |  |
Balance at beginning of the year | 7.9 | 16.6 |
Increases related to current year tax positions | 0.7 | 1.5 |
Increases related to new judgments | 0.0 | 0.7 |
Decreases related to audit settlements and statute expirations | (1.0) | (10.9) |
Balance at the end of the year | 7.6 | 7.9 | $ 16.6
Income Tax Penalties and Interest Expense [Abstract] |  |  |
Unrecognized tax benefits, interest and penalties | 0.0 |  |
Unrecognized tax benefits, accrued interest and penalties | 1.9 |  |
Cash paid for income taxes [Abstract] |  |  |
Net cash Income taxes paid | 28.5 | $ 29.5 | $ 43.8
Undistributed earnings of foreign subsidiaries [Abstract] |  |  |
Foreign subsidiaries' undistributed earnings | 460.1 |  |
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 | $ 17.6 |  |
Expiration period | 20 years |  |
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 | $ 13.5 |  |

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