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Reconciliation of Federal Tax Rate to Effective Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Taxes computed at the federal rate |  | $ (30.3) | $ (256.9) | $ (167.3)
Goodwill impairment |  | 36.6 | 0.0 | 0.0
State and local income taxes, net of federal tax benefit |  | 0.0 | (26.8) | (20.6)
Valuation allowance |  | (14.5) | 171.5 | 74.5
Repatriation of foreign earnings |  | 14.2 | 2.1 | 13.4
Change in federal tax rate and law change | $ (4.1) | (4.1) | 0.0 | 0.0
Foreign earnings taxed at different rate |  | (7.2) | (5.3) | (11.2)
Adjustment to prior years’ taxes |  | (5.2) | 3.4 | (5.4)
Foreign exchange differences |  | 2.6 | 0.0 | 0.0
Withholding taxes |  | 2.2 | 0.0 | 0.0
Other |  | (1.1) | 5.1 | 4.5
Income tax benefit |  | $ (6.8) | $ (106.9) | $ (112.1)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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