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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, 2016 | [2] | Sep. 30, 2016 | [2] | Jun. 30, 2016 | [2] | Mar. 31, 2016 | [2] | Dec. 31, 2015 | [2] | Sep. 30, 2015 | [2] | Jun. 30, 2015 | [2] | Mar. 31, 2015 | [2] | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 |  |  |  |  |  |  |  |  |  | $ 290.6 | $ 266.8 | $ 252.3
State and local income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  |  | 4.3 | 18.3 | 21.4
Impact of foreign operations, including withholding taxes |  |  |  |  |  |  |  |  |  | (23.9) | 14.7 | 0.9
Change in net valuation allowance | [1] |  |  |  |  |  |  |  |  | (13.4) | (20.6) | (66.0)
Divestitures |  |  |  |  |  |  |  |  |  | 9.7 | 11.9 | 0.0
U.S. federal tax credits |  |  |  |  |  |  |  |  |  | (44.6) | 0.0 | 0.0
Stock Compensation |  |  |  |  |  |  |  |  |  | (9.0) | 0.0 | 0.0
Increase (decrease) in unrecognized tax benefits |  |  |  |  |  |  |  |  |  | (22.2) | (6.5) | 5.2
Statutory tax rate changes |  |  |  |  |  |  |  |  |  | 11.4 | 1.4 | 0.8
Other |  |  |  |  |  |  |  |  |  | (4.9) | (3.2) | 1.9
Total provision for income taxes |  | $ 106.1 | $ 63.8 | $ 43.7 | $ (15.6) | $ 145.4 | $ 61.1 | $ 77.7 | $ (1.4) | $ 198.0 | $ 282.8 | $ 216.5
Effective income tax rate on operations |  |  |  |  |  |  |  |  |  | 23.80% | 37.10% | 30.00%
[1] | Reflects changes in valuation allowance that impacted the effective income tax rate for each year presented.
[2] | The three months ended March 31, 2016 included tax benefits of $12.2 and $7.5 due to the reversal of valuation allowances and the adoption of FASB ASU 2016-09, respectively. The three months ended June 30 and December 31, 2016 included tax benefits of $23.4 related to the conclusion and settlement of a tax examination of previous years and $37.4 for refunds to be claimed on future amended U.S. federal returns, respectively.

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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=65882285&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=65882285&loc=d3e32687-109319 + 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 the disposition of a business not qualifying as a discontinued operation. + 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=65882285&loc=d3e32698-109319 Reference 2: 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=65882285&loc=d3e32687-109319 + Details
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