Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

The components of deferred income taxes at December 31 are as follows:



	2015			2014
Deferred tax assets relating to:
Retirement benefits	$	364.8		$	357.7
Accrued expenses	344.6			329.9
Insurance reserves	247.1			209.7
Net operating loss carryforwards	18.1			14.8
Bad debt reserves	154.8			132.9
State income tax	43.4			40.6
Deferred compensation	40.1			46.6
Investment basis difference	62.2			88.2
Other	68.4			34.2
Total deferred tax assets	1,343.5			1,254.6
Valuation allowance	—			(2.6		)
Total deferred tax assets, net of valuation allowance	1,343.5			1,252.0
Deferred tax liabilities relating to:
Unrealized gains on securities	127.8			331.4
Intangible assets:
Trademarks and state Medicaid licenses	2,547.6			2,444.3
Customer, provider and hospital relationships	269.2			308.6
Internally developed software and other amortization differences	436.6			403.6
Retirement benefits	252.7			241.1
Debt discount	61.9			184.0
State deferred tax	36.4			49.1
Depreciation and amortization	44.2			29.6
Other	197.7			205.9
Total deferred tax liabilities	3,974.1			4,197.6
Net deferred tax liability	$	(2,630.6	)	$	(2,945.6	)

Components Of Provision For Income Taxes

Significant components of the provision for income taxes for the years ended December 31 consist of the following:



	2015			2014		2013
Current tax expense (benefit):
Federal	$	1,996.6		$	1,629.4	$	1,226.4
State and local	133.0			65.8		(42.6		)
Total current tax expense	2,129.6			1,695.2		1,183.8
Deferred tax (benefit) expense	(58.6		)	112.8		22.1
Total income tax expense	$	2,071.0		$	1,808.0	$	1,205.9

Reconciliation Of Income Tax Expense Computed At The Statutory Federal Income Tax Rate

A reconciliation of income tax expense recorded in the consolidated statements of income and amounts computed at the statutory federal income tax rate for the years ended December 31 is as follows:



	2015					2014					2013
	Amount			Percent		Amount			Percent		Amount			Percent
Amount at statutory rate	$	1,620.9		35.0	%	$	1,528.8		35.0	%	$	1,344.1		35.0	%
State and local income taxes net of federal tax benefit	75.3			1.6		49.0			1.1		24.4			0.6
Tax exempt interest and dividends received deduction	(63.2		)	(1.3	)	(65.9		)	(1.5	)	(64.9		)	(1.7	)
HIP Fee	422.6			9.1		312.6			7.2		—			—
Other, net	15.4			0.3		(16.5		)	(0.4	)	(97.7		)	(2.5	)
Total income tax expense	$	2,071.0		44.7	%	$	1,808.0		41.4	%	$	1,205.9		31.4	%

Change In The Carrying Amount Of Gross Unrecognized Tax Benefits From Uncertain Tax Positions

The change in the carrying amount of gross unrecognized tax benefits from uncertain tax positions for the years ended December 31 is as follows:



	2015			2014
Balance at January 1	$	115.8		$	103.2
Additions for tax positions related to:
Current year	39.8			10.9
Prior years	65.1			31.3
Reductions related to:
Tax positions of prior years	(7.9		)	(24.5		)
Settlements with taxing authorities	(0.8		)	(5.1		)
Balance at December 31	$	212.0		$	115.8