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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2012
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 51.6 |  | $ 51.6 | $ 50.8 |  |  |
Income tax expense |  |  | 56.7 | 51.2 | $ 26.4 |  |
Income before income tax |  |  | $ 163.5 | $ 157.9 | $ 158.1 |  |
Effective tax rate |  |  | 34.70% | 32.40% | 16.70% |  |
Excess benefit from stock-based compensation |  |  | $ (0.2) | $ 2.5 | $ 5.6 |  |
U.S. statutory rate |  |  | 21.00% | 21.00% | 35.00% |  |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) |  |  |  | $ 3.1 |  |  |
Tax Cuts and Jobs Act, Transition Tax, Income Tax Expense |  |  |  | 0.3 |  |  |
Tax Cuts and Jobs Act, Effect on Executive Compensation, Income Tax Expense |  |  |  | 3.3 |  |  |
Tax Cuts and Jobs Act, Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions, Executive Compensation |  |  |  | 1.5 |  |  |
Tax Cuts and Jobs Act, Impairment of Deferred Tax Assets, Executive Compensation, Income Tax Expense |  |  |  | 1.8 |  |  |
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset - Pension, Income Tax Benefit |  |  |  | 0.5 |  |  |
Additions for tax positions of prior years |  |  | $ 8.4 | 3.1 | $ 2.9 |  |
Deferred Federal Income Tax Expense (Benefit) - Undistributed Earnings of Foreign Subsidiaries |  |  | 2.0 |  |  |  |
Undistributed Earnings of Foreign Subsidiaries Not Permanently Reinvested | 331.0 |  | 331.0 |  |  |  |
Undistributed earnings of foreign subsidiaries | 177.0 |  | 177.0 |  |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 30.1 |  | 30.1 |  |  |  |
Unrecognized tax benefits | 50.5 |  | 50.5 | 43.7 | 47.2 | $ 43.7 |
Foreign tax credit carryforwards | 25.2 |  | $ 25.2 | 25.2 |  |  |
State and Local Jurisdiction | Minimum |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Statutes of limitation, period |  |  | 2 years |  |  |  |
State and Local Jurisdiction | Maximum |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Statutes of limitation, period |  |  | 5 years |  |  |  |
Foreign Tax Authority | Minimum |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Statutes of limitation, period |  |  | 2 years |  |  |  |
Foreign Tax Authority | Maximum |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Statutes of limitation, period |  |  | 5 years |  |  |  |
Foreign Tax Authority | Australian Taxation Office | Earliest Tax Year |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Open tax year |  |  | 2015 |  |  |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Income tax expense | $ 1.6 |  |  |  |  |  |
Penalty rate | 75.00% |  | 75.00% |  |  |  |
Potential penalty rate | 150.00% |  | 150.00% |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes - Foreign, Amount |  |  | $ 5.6 |  |  |  |
Income tax examination, interest expense |  |  | $ 0.9 | 1.1 | 2.2 |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Open tax year |  |  | 2014 |  |  |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Years 2007-2012 |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  |  | $ 44.5
Potential tax assessment, accrued reserve related to fair value of liabilities acquired |  |  |  |  |  |  | $ 43.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2008 to 2010 |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Additions for tax positions of prior years |  | $ 5.6 |  |  |  |  |
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Open tax year |  |  | 2015 |  |  |  |
Foreign Tax Authority | Federal Ministry of Finance, Germany | Earliest Tax Year |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Open tax year |  |  | 2015 |  |  |  |
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Open tax year |  |  | 2015 |  |  |  |
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Open tax year |  |  | 2018 |  |  |  |
Domestic Tax Authority | Internal Revenue Service (IRS) |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit) |  |  |  |  | (25.7) |  |
Transition Toll Tax - net |  |  |  |  | 24.0 |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit |  |  |  |  | 49.7 |  |
Foreign tax credit carryforwards |  |  |  |  | $ 14.0 |  |
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Open tax year |  |  | 2016 |  |  |  |
U.S. | Pension |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan Contributions By Employer, Additional Tax Deductible Contribution |  |  |  | $ 4.1 |  |  |
Other Noncurrent Liabilities | Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2010 [Member] |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Unrecognized tax benefits | $ 34.8 |  | $ 34.8 |  |  |  |

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