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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
Income tax provision at U.S. federal statutory rate |  |  |  |  |  |  |  |  |  | $ 176.0 | $ 294.3 | $ 289.0
State and local income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  |  | 23.8 | 23.5 | 4.3
Impact of foreign operations, including withholding taxes |  |  |  |  |  |  |  |  |  | 50.7 | (6.7) | (23.9)
U.S. tax incentives |  |  |  |  |  |  |  |  |  | (17.5) | (1.3) | (1.3)
Change in net valuation allowance | [1] |  |  |  |  |  |  |  |  | (16.9) | 1.4 | (13.4)
Divestitures |  |  |  |  |  |  |  |  |  | 11.7 | 1.1 | 9.7
U.S. federal tax credits |  |  |  |  |  |  |  |  |  | (48.1) | (0.4) | (44.6)
Stock compensation |  |  |  |  |  |  |  |  |  | (6.8) | (15.3) | (9.0)
Change in unrecognized tax benefits |  |  |  |  |  |  |  |  |  | 8.4 | 7.0 | (21.8)
Net impact of the Tax Act |  |  |  |  |  |  |  |  |  | 13.4 | (36.0) | 0.0
Statutory tax rate changes |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 11.4
Other |  |  |  |  |  |  |  |  |  | 4.5 | 3.7 | (3.5)
Provision for income taxes |  | $ 62.2 | $ 60.7 | $ 63.6 | $ 12.7 | $ 135.1 | $ 54.9 | $ 81.6 | $ (0.3) | $ 199.2 | $ 271.3 | $ 196.9
Effective income tax rate on operations |  |  |  |  |  |  |  |  |  | 23.80% | 32.30% | 23.80%
[1] | Reflects changes in valuation allowances that impacted the effective income tax rate for each year presented.

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