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Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Income tax provision at U.S. federal statutory rate |  |  |  |  |  |  |  |  |  | $ 75.9 | $ 184.5 | $ 176.0
State and local income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  |  | 9.4 | 14.0 | 23.8
Impact of foreign operations, including withholding taxes |  |  |  |  |  |  |  |  |  | 49.9 | 34.2 | 50.7
U.S. tax incentives |  |  |  |  |  |  |  |  |  | (23.6) | (21.4) | (17.5)
Change in net valuation allowance | [1] |  |  |  |  |  |  |  |  | (1.3) | (26.3) | (16.9)
Divestitures |  |  |  |  |  |  |  |  |  | 8.6 | 9.6 | 11.7
U.S. federal tax credits |  |  |  |  |  |  |  |  |  | (1.7) | 0.4 | (48.1)
Change in unrecognized tax benefits |  |  |  |  |  |  |  |  |  | 30.8 | 14.1 | 8.4
Net impact of the Tax Act |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 13.4
Other |  |  |  |  |  |  |  |  |  | (3.8) | (4.3) | (2.3)
Provision for income taxes |  | $ 58.1 | $ (86.3) | $ 19.0 | $ 17.2 | $ 86.1 | $ 64.6 | $ 43.6 | $ 10.5 | $ 8.0 | $ 204.8 | $ 199.2
Effective income tax rate on operations |  |  |  |  |  |  |  |  |  | 2.20% | 23.30% | 23.80%
Tax Adjustments, Settlements, and Unusual Provisions |  |  | $ 136.2 |  |  |  |  | $ 13.9 |  | $ (136.2) | $ 0.0 | $ 0.0
[1] | Reflects changes in valuation allowances that impacted the effective income tax rate for each year presented.

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- Definition Percentage 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/disclosureRef -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 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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