INCOME TAXES	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company does not recognize a tax benefit unless the Company concludes that it is more likely than not that the benefit will be sustained on audit by the taxing authority based solely on the technical merits of the associated tax position. If the recognition threshold is met, the Company recognizes a tax benefit measured at the largest amount of the tax benefit that the Company believes is greater than 50% likely to be realized. The gross unrecognized income tax benefits were $21.2 and $19.5 at March 31, 2018 and December 31, 2017, respectively. It is anticipated that the amount of the unrecognized income tax benefits will change within the next 12 months; however, these changes are not expected to have a significant impact on the results of operations, cash flows or the financial position of the Company. As of March 31, 2018 and December 31, 2017, $21.2 and $19.5, respectively, are the approximate amounts of gross unrecognized income tax benefits that, if recognized, would favorably affect the effective income tax rate in future periods. The Company recognizes interest and penalties related to unrecognized income tax benefits in income tax expense. Accrued interest and penalties related to uncertain tax positions totaled $8.5 and $7.9 as of March 31, 2018 and December 31, 2017, respectively. The Company has substantially concluded all U.S. federal income tax matters for years through 2012. Substantially all material state and local, and foreign income tax matters have been concluded through 2012 and 2009, respectively. The Internal Revenue Service concluded the examination of the Company's 2014 federal consolidated income tax return in 2016, which did not include Covance. Covance's 2013 federal consolidated income tax return is currently under examination by the Internal Revenue Service. The Canada Revenue Agency is currently examining the Company's Canadian subsidiaries' 2013 and 2014 tax returns. The Company has various state and foreign income tax examinations ongoing throughout the year. In the first quarter of 2018, the Canada Revenue Agency expanded their audit to include the 2015 tax return. The Company believes adequate provisions have been recorded related to all open tax years. On December 22, 2017 the SEC issued Staff Accounting Bulletin No. 118 (SAB 118), which provides companies with additional guidance on how to account for the TCJA in its financial statements, allowing companies to use a measurement period. At March 31, 2018, the Company had not completed the accounting for the tax effects of enactment of the TCJA; however, as described below, a reasonable estimate on the re-measurement of the Company's existing deferred tax balances, the deferred tax revaluation for unremitted foreign earnings, and the one-time repatriation tax has been made. For these items, in accordance with SAB 118, a provisional net benefit of $519.0 was recognized in the fourth quarter of 2017. In the first quarter of 2018, the Company continued its review and recorded net additional provisional expense of $14.9. The TCJA includes provisions relating to global intangible low-taxed income (GILTI). Relevant to the current consolidated financial statements is the Company's selection of an accounting policy with respect to the new GILTI tax rules, and whether to account for GILTI as a periodic charge in the period it arises or to record deferred taxes associated with the basis in the Company's foreign subsidiaries. Due to the intricacy of this topic, the Company is still in the process of investigating the implications of accounting for the GILTI tax and intends to make an accounting policy decision once additional guidance is available for assessment. For the first quarter of 2018, the Company recorded its estimated GILTI tax as a periodic charge.

INCOME TAXES

The Company does not recognize a tax benefit unless the Company concludes that it is more likely than not that the benefit will be sustained on audit by the taxing authority based solely on the technical merits of the associated tax position. If the recognition threshold is met, the Company recognizes a tax benefit measured at the largest amount of the tax benefit that the Company believes is greater than 50% likely to be realized.

The gross unrecognized income tax benefits were $21.2 and $19.5 at March 31, 2018 and December 31, 2017, respectively. It is anticipated that the amount of the unrecognized income tax benefits will change within the next 12 months; however, these changes are not expected to have a significant impact on the results of operations, cash flows or the financial position of the Company.

As of March 31, 2018 and December 31, 2017, $21.2 and $19.5, respectively, are the approximate amounts of gross unrecognized income tax benefits that, if recognized, would favorably affect the effective income tax rate in future periods.

The Company recognizes interest and penalties related to unrecognized income tax benefits in income tax expense. Accrued interest and penalties related to uncertain tax positions totaled $8.5 and $7.9 as of March 31, 2018 and December 31, 2017, respectively.

The Company has substantially concluded all U.S. federal income tax matters for years through 2012. Substantially all material state and local, and foreign income tax matters have been concluded through 2012 and 2009, respectively.

The Internal Revenue Service concluded the examination of the Company's 2014 federal consolidated income tax return in 2016, which did not include Covance. Covance's 2013 federal consolidated income tax return is currently under examination by the Internal Revenue Service. The Canada Revenue Agency is currently examining the Company's Canadian subsidiaries' 2013 and 2014 tax returns. The Company has various state and foreign income tax examinations ongoing throughout the year. In the first quarter of 2018, the Canada Revenue Agency expanded their audit to include the 2015 tax return. The Company believes adequate provisions have been recorded related to all open tax years.

On December 22, 2017 the SEC issued Staff Accounting Bulletin No. 118 (SAB 118), which provides companies with additional guidance on how to account for the TCJA in its financial statements, allowing companies to use a measurement period. At March 31, 2018, the Company had not completed the accounting for the tax effects of enactment of the TCJA; however, as described below, a reasonable estimate on the re-measurement of the Company's existing deferred tax balances, the deferred tax revaluation for unremitted foreign earnings, and the one-time repatriation tax has been made. For these items, in accordance with SAB 118, a provisional net benefit of $519.0 was recognized in the fourth quarter of 2017. In the first quarter of 2018, the Company continued its review and recorded net additional provisional expense of $14.9.

The TCJA includes provisions relating to global intangible low-taxed income (GILTI). Relevant to the current consolidated financial statements is the Company's selection of an accounting policy with respect to the new GILTI tax rules, and whether to account for GILTI as a periodic charge in the period it arises or to record deferred taxes associated with the basis in the Company's foreign subsidiaries. Due to the intricacy of this topic, the Company is still in the process of investigating the implications of accounting for the GILTI tax and intends to make an accounting policy decision once additional guidance is available for assessment. For the first quarter of 2018, the Company recorded its estimated GILTI tax as a periodic charge.