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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Tax Note Textuals [Line Items] |  |  |
Change in assessment | $ (5.6) | $ 22.9 | $ 0.0
Aggregate Net Tax Expense from US Tax Reform |  |  | 129.2
Undistributed Earnings of Foreign Subsidiaries | 1,415.0 |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 107.5 |  |
Net operating loss carryforwards in Luxembourg | 230.3 |  |
Excess Tax benefit from stock activity | $ 4.6 | 2.2 | 2.7
The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement | The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. |  |
Estimated change in unrecognized tax benefits | $ 14.0 |  |
Interest (income) expense related to tax matters | (0.3) | (0.9) | (2.4)
Interest accrued from income tax examinations | 2.9 | $ 3.2 | $ 4.1
Continuing Operations [Member] |  |  |
Tax Note Textuals [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 20.9 |  |
Discontinued Operations [Member] |  |  |
Tax Note Textuals [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1.2 |  |
Impacts from U.S. Tax Act of 2017 [Member] |  |  |
Tax Note Textuals [Line Items] |  |  |
2017 U.S. Federal Statutory Tax Rate |  |  | 35.00%
2018 U.S. Federal Statutory Tax Rate |  | 21.00% |
One Time Provisional US Tax Expense on Post 1986 Foreign Earnings |  |  | $ 57.9
Remeasurement of US Net Deferred Taxes |  |  | 86.0
Tax Expense on Undistributed Foreign Earnings |  |  | 14.7
Foreign Tax Authority [Member] |  |  |
Tax Note Textuals [Line Items] |  |  |
Change in assessment | $ (5.6) | $ 22.9 | $ 0.0

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