Income Taxes	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During the three months ended March 31, 2017 and 2016, we recognized income tax expense of $505.1 and $609.0, respectively. The decrease in income tax expense was primarily due to suspension of the non-tax deductible Health Insurance Provider Fee, or HIP Fee, for 2017. For the three months ended March 31, 2016, the HIP Fee resulted in additional income tax expense of $104.1. The decrease in income tax expense was further due to the recognition of excess tax benefits during the three months ended March 31, 2017 from the adoption of ASU 2016-09, as discussed in Note 2, "Basis of Presentation and Significant Accounting Policies - Recently Adopted Accounting Guidance." These decreases were partially offset by the impact of increased income before income tax expense. The effective tax rates in 2017 and 2016 were 33.3% and 46.4%, respectively. The decrease in the effective tax rate was primarily due to the suspension of the HIP Fee for 2017, the excess tax benefits from adoption of ASU 2016-09 and a discrete tax adjustment recognized during the three months ended March 31, 2016 related to net realized losses on financial instruments.

Income Taxes

3 Months Ended

Mar. 31, 2017

During the three months ended March 31, 2017 and 2016, we recognized income tax expense of $505.1 and $609.0, respectively. The decrease in income tax expense was primarily due to suspension of the non-tax deductible Health Insurance Provider Fee, or HIP Fee, for 2017. For the three months ended March 31, 2016, the HIP Fee resulted in additional income tax expense of $104.1. The decrease in income tax expense was further due to the recognition of excess tax benefits during the three months ended March 31, 2017 from the adoption of ASU 2016-09, as discussed in Note 2, "Basis of Presentation and Significant Accounting Policies - Recently Adopted Accounting Guidance." These decreases were partially offset by the impact of increased income before income tax expense.

The effective tax rates in 2017 and 2016 were 33.3% and 46.4%, respectively. The decrease in the effective tax rate was primarily due to the suspension of the HIP Fee for 2017, the excess tax benefits from adoption of ASU 2016-09 and a discrete tax adjustment recognized during the three months ended March 31, 2016 related to net realized losses on financial instruments.