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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Summary of Provision for Income Taxes |
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (Dollars in millions) |
Components of Earnings and Taxes from Operations |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  | $ | 41.5 |  |  | $ | 25.9 |  |  | $ | (71.4 | )
International |  |  | (61.6 | ) |  |  | 8.4 |  |  |  | 44.5 |
Total |  | $ | (20.0 | ) |  | $ | 34.3 |  |  | $ | (26.9 | )
Income Tax Expense (Benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  | $ | (6.5 | ) |  | $ | 7.1 |  |  | $ | 3.8 |
State and local |  |  | 0.1 |  |  |  | 0.4 |  |  |  | 0.3 |
International |  |  | (2.6 | ) |  |  | 17.5 |  |  |  | 20.4 |
Total current income tax expense |  |  | (9.0 | ) |  |  | 25.0 |  |  |  | 24.5 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | (1.1 | ) |  |  | (42.6 | ) |  |  | (14.1 | )
State and local |  |  | 0.1 |  |  |  | (19.3 | ) |  |  | (2.2 | )
International |  |  | (6.0 | ) |  |  | (7.5 | ) |  |  | 0.2 |
Total deferred income tax benefit |  |  | (7.0 | ) |  |  | (69.4 | ) |  |  | (16.1 | )
Total income tax (benefit) expense |  | $ | (16.0 | ) |  | $ | (44.4 | ) |  | $ | 8.4 |
Reconciliation of U.S. Federal Statutory Rate |
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Effective Rate Reconciliation |  |  |  |  |  |  |  |  |  |  |  |
U.S. statutory rate% |  |  | 21.0 | % |  |  | 21.0 | % |  |  | (21.0 | )%
Change in valuation allowance |  |  | (0.3 | ) |  |  | (176.1 | ) |  |  | 10.8 |
State income taxes, net of federal benefit |  |  | 2.2 |  |  |  | 3.9 |  |  |  | (31.2 | )
Share-based compensation |  |  | 3.9 |  |  |  | (5.8 | ) |  |  | (10.0 | )
International tax rate differential |  |  | 8.9 |  |  |  | 3.8 |  |  |  | 13.4 |
Foreign dividend income |  |  | — |  |  |  | — |  |  |  | 20.1 |
Foreign capital gain income |  |  | (7.5 | ) |  |  | 3.2 |  |  |  | 7.1 |
Unremitted foreign earnings |  |  | 14.5 |  |  |  | (2.0 | ) |  |  | 4.1 |
Global intangible low-taxed income |  |  | — |  |  |  | — |  |  |  | 23.0 |
Base erosion tax |  |  | 33.9 |  |  |  | 19.9 |  |  |  | 14.1 |
Reserve for tax contingencies |  |  | 1.2 |  |  |  | (0.3 | ) |  |  | 0.4 |
Change in tax rate |  |  | — |  |  |  | (1.0 | ) |  |  | (5.9 | )
Other |  |  | 2.2 |  |  |  | 4.0 |  |  |  | 6.3 |
Income tax provision% |  |  | 80.0 | % |  |  | (129.4 | )% |  |  | 31.2 | %
Schedule of Deferred Tax Assets and Liabilities |
|  | December 31, |
|  | 2020 |  |  | 2019 |
|  | (Dollars in millions) |
Tax Effect of Items That Comprise a Significant Portion of the Net Deferred Tax Asset and Deferred Tax Liability |  |  |  |  |  |  |  |
Deferred Tax Asset: |  |  |  |  |  |  |  |
Employment related accruals |  | $ | 9.8 |  |  | $ | 41.6 |
Other |  |  | 7.5 |  |  |  | — |
Foreign tax credit carryover and other credit carryovers |  |  | 0.2 |  |  |  | 0.3 |
Net operating loss carryforwards |  |  | 125.9 |  |  |  | 82.7 |
Total gross deferred tax asset |  |  | 143.4 |  |  |  | 124.6 |
Valuation allowance |  |  | (16.3 | ) |  |  | (15.1 | )
Total deferred tax asset |  | $ | 127.1 |  |  | $ | 109.5 |
Deferred Tax Liability: |  |  |  |  |  |  |  |
Intangibles |  | $ | (61.7 | ) |  | $ | (57.3 | )
Other |  |  | (55.2 | ) |  |  | (32.0 | )
Total deferred tax liability |  |  | (116.9 | ) |  |  | (89.3 | )
Net deferred tax asset (liability) |  | $ | 10.2 |  |  | $ | 20.2 |
|  | December 31, |
|  | 2020 |  |  | 2019 |
|  | (Dollars in millions) |
Net Deferred Tax by Geography |  |  |  |  |  |  |  |
U.S. |  | $ | 22.0 |  |  | $ | 32.2 |
International |  |  | (11.8 | ) |  |  | (12.0 | )
Total |  | $ | 10.2 |  |  | $ | 20.2 |
Summary of Activity Related to Unrecognized Tax Benefits | The following table summarizes the activity for unrecognized tax benefits:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
|  | (Dollars in millions) |
Federal, State and Foreign Tax |  |  |  |  |  |  |  |
Beginning unrecognized tax balance |  | $ | 1.5 |  |  | $ | 1.3 |
Increase prior period positions |  |  | 0.1 |  |  |  | 0.1 |
Increase current period positions |  |  | 0.2 |  |  |  | 0.2 |
Decrease prior period positions |  |  | — |  |  |  | (0.1 | )
Ending unrecognized tax benefits |  | $ | 1.8 |  |  | $ | 1.5 |

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