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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2012
Income Tax Examination [Line Items] |  |  |  |  |
Income tax expense | $ 3.1 |  | $ 10.6 |  |
Income before income tax | $ 11.1 |  | $ 10.0 |  |
Effective Income Tax Rate Reconciliation, Percent | 27.90% |  | 106.00% |  |
Deferred State and Local Income Tax Expense (Benefit) |  |  | $ 0.8 |  |
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 |  |  |  |
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Open tax year | 2016 |  |  |  |
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 |  |  |
Income Tax Examination, Interest Expense | $ 0.1 |  | 0.3 |  |
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 Year 2007 to 2012 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Unrecognized Tax Benefits |  |  |  |  | $ 44.5
Income Tax Contingency, Potential Assessment, Acquisition, Fair Value of Liabilities Accrued |  |  |  |  | $ 43.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2008 to 2010 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  |  | $ 5.6 |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2011 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount |  |  |  | $ 5.6 |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Minimum |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Penalty rate | 75.00% |  |  |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Maximum | Tax Year 2007 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Penalty rate | 150.00% |  |  |  |
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 |  |  |  |
Other Noncurrent Liabilities | Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2010 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Unrecognized Tax Benefits | $ 27.0 |  |  |  |

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