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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, 2017 | [2] | Sep. 30, 2017 | [2] | Jun. 30, 2017 | [2] | Mar. 31, 2017 | [2] | Dec. 31, 2016 | [2] | Sep. 30, 2016 | [2] | Jun. 30, 2016 | [2] | Mar. 31, 2016 | [2] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Income tax provision at U.S. federal statutory rate |  |  |  |  |  |  |  |  |  | $ 306.6 | $ 290.6 | $ 266.8
State and local income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  |  | 23.5 | 4.3 | 18.3
Impact of foreign operations, including withholding taxes |  |  |  |  |  |  |  |  |  | (6.7) | (23.9) | 14.7
Change in net valuation allowance | [1] |  |  |  |  |  |  |  |  | 1.4 | (13.4) | (20.6)
Divestitures |  |  |  |  |  |  |  |  |  | 1.1 | 9.7 | 11.9
U.S. federal tax credits |  |  |  |  |  |  |  |  |  | (1.7) | (44.6) | 0.0
Stock Compensation |  |  |  |  |  |  |  |  |  | (15.3) | (9.0) | 0.0
Increase (decrease) in unrecognized tax benefits |  |  |  |  |  |  |  |  |  | 7.0 | (22.2) | (6.5)
Net impact of the Tax Act |  |  |  |  |  |  |  |  |  | (36.0) | 0.0 | 0.0
Statutory tax rate changes |  |  |  |  |  |  |  |  |  | 0.0 | 11.4 | 1.4
Other |  |  |  |  |  |  |  |  |  | 2.0 | (4.9) | (3.2)
Total provision for income taxes |  | $ 166.1 | $ 42.5 | $ 75.4 | $ (2.1) | $ 106.1 | $ 63.8 | $ 43.7 | $ (15.6) | $ 281.9 | $ 198.0 | $ 282.8
Effective income tax rate on operations |  |  |  |  |  |  |  |  |  | 32.20% | 23.80% | 37.10%
[1] | Reflects changes in valuation allowances that impacted the effective income tax rate for each year presented.
[2] | The three months ended September 30, 2017 included a tax benefit of $31.2 related to foreign tax credits from distributions of unremitted earnings, which was reversed during the three months ended December 31, 2017 as a result of the enactment of the Tax Cuts and Jobs Act. The three months ended December 31, 2017 included a net tax benefit of $36.0 as a result of the enactment of the Tax Cuts and Jobs Act. The three months ended March 31, 2016 included a tax benefit of $12.2 due to the reversal of valuation allowances. The three months ended June 30, 2016 included a tax benefit of $23.4 related to the conclusion and settlement of a tax examination of previous years. The three months ended December 31, 2016 included a tax benefit of $37.4 for refunds to be claimed on future amended U.S. federal returns.

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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/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 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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 + Details
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