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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Possible decrease in tax expense in next 12 months | $ 3.3 |  | $ 3.3 |  |
Taxes paid on cash distribution | 16.6 |  | 16.6 |  | $ 28.5
Reversal of U.S. undistributed earnings accrual | $ 14.8 |  | $ 14.8 |  |
Effective income tax rate | 25.80% | 38.50% | 31.90% | 39.80% |
Decrease in income tax expense | $ 16.9 |  | $ 14.4 |  |
Effect of U.S. tax reform |  | $ 15.3 |  | $ 15.3 |
Effect of U.S. tax reform, BEAT | 10.2 |  | 11.7 |  |
Income tax expense from reorganization | $ 4.6 |  | 8.3 |  |
TCJA tax expense, provisional |  |  |  |  | $ 19.0
Measurement period adjustment |  |  | 0.9 |  |
TCJA tax expense, after adjustments |  |  | $ 18.1 |  |

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