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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive income (loss) were as follows:
|  | Foreign Currency Translation Adjustment |  |  | Unrealized Gain (Loss) from Invested Customer Trust Funds |  |  | Pension Liability Adjustment |  |  | Total |
|  | (Dollars in millions) |
Balance as of December 31, 2018 |  | $ | (207.5 | ) |  | $ | (18.3 | ) |  | $ | (150.1 | ) |  | $ | (375.9 | )
Other comprehensive loss before income taxes and reclassifications |  |  | 29.1 |  |  |  | 37.7 |  |  |  | (0.3 | ) |  |  | 66.5 |
Income tax benefit |  |  | — |  |  |  | (9.6 | ) |  |  | (2.4 | ) |  |  | (12.0 | )
Reclassifications to earnings |  |  | — |  |  |  | — |  |  |  | 10.1 |  |  |  | 10.1 |
Other comprehensive income |  |  | 29.1 |  |  |  | 28.1 |  |  |  | 7.4 |  |  |  | 64.6 |
Cumulative-effect adjustment related to the adoption of ASU 2018-02 |  |  | — |  |  |  | 0.4 |  |  |  | (27.5 | ) |  |  | (27.1 | )
Balance as of December 31, 2019 |  |  | (178.4 | ) |  |  | 10.2 |  |  |  | (170.2 | ) |  |  | (338.4 | )
Other comprehensive loss before income taxes and reclassifications |  |  | 18.7 |  |  |  | 38.4 |  |  |  | 8.0 |  |  |  | 65.1 |
Income tax benefit |  |  | — |  |  |  | (10.2 | ) |  |  | (5.7 | ) |  |  | (15.9 | )
Reclassifications to earnings |  |  | — |  |  |  | — |  |  |  | 13.2 |  |  |  | 13.2 |
Other comprehensive income |  |  | 18.7 |  |  |  | 28.2 |  |  |  | 15.5 |  |  |  | 62.4 |
Balance as of December 31, 2020 |  | $ | (159.7 | ) |  | $ | 38.4 |  |  | $ | (154.7 | ) |  | $ | (276.0 | )

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