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Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Federal statutory | $ (128.2) | $ (111.9) | $ (23.9)
Foreign income taxes | (21.5) | (40.2) | (39.7)
Change in enacted tax rate | 2.1 | 0.2 | (8.3)
Transition tax | 0.0 | (7.5) | 5.8
State and local | (5.0) | (20.0) | (12.8)
Tax credits | (9.7) | (9.6) | (20.1)
Valuation allowance | 19.8 | 12.6 | 12.9
Goodwill impairment | 107.1 | 92.4 | 21.6
Withholding taxes | 5.6 | 4.0 | 6.6
U.S. tax on unremitted foreign earnings | 0.0 | (2.8) | 4.1
Tax benefit on loss carryback | (14.4) | 0.0 | 0.0
Global intangible low-taxed income | 2.3 | 31.1 | 8.0
Uncertain tax positions | (8.8) | 5.9 | (9.8)
Other | 1.5 | (3.1) | (1.5)
Total income tax benefit | $ (49.2) | $ (48.9) | $ (57.1)

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