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Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
Income tax provision at U.S. federal statutory rate |  |  |  |  |  |  |  |  |  | $ 184.5 | $ 176.0 | $ 294.3
State and local income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  |  | 14.0 | 23.8 | 23.5
Impact of foreign operations, including withholding taxes |  |  |  |  |  |  |  |  |  | 34.2 | 50.7 | (6.7)
U.S. tax incentives |  |  |  |  |  |  |  |  |  | (21.4) | (17.5) | (1.3)
Change in net valuation allowance | [1] |  |  |  |  |  |  |  |  | (26.3) | (16.9) | 1.4
Divestitures |  |  |  |  |  |  |  |  |  | 9.6 | 11.7 | 1.1
U.S. federal tax credits |  |  |  |  |  |  |  |  |  | 0.4 | (48.1) | (0.4)
Stock compensation |  |  |  |  |  |  |  |  |  | (3.3) | (6.8) | (15.3)
Change in unrecognized tax benefits |  |  |  |  |  |  |  |  |  | 14.1 | 8.4 | 7.0
Net impact of the Tax Act |  |  |  |  |  |  |  |  |  | 0.0 | 13.4 | (36.0)
Other |  |  |  |  |  |  |  |  |  | (1.0) | 4.5 | 3.7
Provision for income taxes |  | $ 86.1 | $ 64.6 | $ 43.6 | $ 10.5 | $ 62.2 | $ 60.7 | $ 63.6 | $ 12.7 | $ 204.8 | $ 199.2 | $ 271.3
Effective income tax rate on operations |  |  |  |  |  |  |  |  |  | 23.30% | 23.80% | 32.30%
[1] | Reflects changes in valuation allowances that impacted the effective income tax rate for each year presented.

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