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Reconciliation of Federal Tax Rate to Effective Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Taxes computed at the federal rate | $ 50.7 | $ 52.0 | $ (30.3)
Goodwill impairment | 0.0 | 0.0 | 36.6
State and local income taxes, net of federal tax benefit | 0.3 | (0.5) | 0.0
Valuation allowance | (90.1) | (48.0) | (14.5)
Repatriation of foreign earnings (GILTI starting in 2018) | 3.5 | 5.4 | 14.2
Restructuring | 4.2 | 0.0 | 0.0
Impact of U.S. tax reform | 0.0 | 5.9 | (4.1)
Foreign earnings taxed at different rate | 2.7 | 3.2 | (3.5)
Adjustment to prior years’ taxes | 0.0 | (5.8) | (5.2)
Withholding taxes | 2.7 | 2.7 | 2.2
Preferential tax rate | (4.1) | (4.8) | (3.7)
Other | 1.6 | 0.9 | 1.5
Income tax provision (benefit) | $ (28.5) | $ 11.0 | $ (6.8)

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