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Income Taxes - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018
Effective Income Tax Reconciliation [Line Items] |  |  |  |
U.S. federal corporate tax rate |  | 35.00% | 35.00% |
Increase in provision for income taxes |  | $ 413.0 | $ 424.1 |
Transition tax |  | 340.9 | 340.9 |
Increase in income tax expense from re-measurement of deferred tax assets and liabilities |  | 101.1 | 101.1 |
Decrease related to reduction of U.S. federal corporate tax rate |  | 25.0 | 25.0 |
Provisional tax amount included as a component of income tax expense from continuing operations |  | 442.0 | 442.0 |
Amount of unrecorded benefit |  | $ 12.6 | $ 12.6 |
Forecast |  |  |  |
Effective Income Tax Reconciliation [Line Items] |  |  |  |
U.S. federal corporate tax rate, blended rate |  |  |  | 28.10%
Subsequent Event |  |  |  |
Effective Income Tax Reconciliation [Line Items] |  |  |  |
U.S. federal corporate tax rate | 21.00% |  |  |

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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/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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 + Details
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