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INCOME TAXES. (Tables)
12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Schedules of provision for income taxes and deferred income taxes (tax benefits)
The deferred income taxes (tax benefits) recognized as part of our provision for income taxes is related to:
(in millions)
2015
 
2016
 
2017
Property and equipment
$
(2.3
)
 
$
3.2

 
$
(3.9
)
Stock-based compensation
(14.6
)
 
1.3

 
72.4

Accrued compensation
(.9
)
 
(1.7
)
 
1.2

Supplemental savings plan liability
(27.4
)
 
(30.9
)
 
(8.3
)
Other-than-temporary impairments of available-for-sale investments
(.4
)
 
10.0

 
7.3

Unrealized holding gains recognized in non-operating income
(2.4
)
 
31.6

 
10.7

Other
4.7

 

 
(7.7
)
Total deferred income taxes (tax benefits)
$
(43.3
)
 
$
13.5

 
$
71.7

The provision for income taxes consists of:
(in millions)
2015
 
2016
 
2017
Current income taxes
 
 
 
 
 
U.S. federal
$
669.5

 
$
573.7

 
$
708.1

State and local
134.3

 
105.8

 
131.0

Foreign
18.9

 
13.5

 
13.1

Deferred income taxes (tax benefits)
(43.3
)
 
13.5

 
71.7

Total
$
779.4

 
$
706.5

 
$
923.9

Schedule of effective income tax rate reconciliation
The following table reconciles the statutory federal income tax rate to our effective income tax rate. 
 
2015
 
2016
 
2017
Statutory U.S. federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
 %
Impact of U.S. tax reform

 

 
2.9

State income taxes for current year, net of federal income tax benefits(1)
4.3

 
3.8

 
3.9

Net income attributable to redeemable non-controlling interests

 
(.7
)
 
(1.3
)
Net excess tax benefits from stock-based compensation plans activity

 
(1.7
)
 
(3.0
)
Other items
(.4
)
 
(.4
)
 
(.6
)
Effective income tax rate
38.9
 %
 
36.0
 %
 
36.9
 %

(1)In 2017, state income benefits totaling (.4)% are reflected in the total benefits for net income attributable to redeemable non-controlling interests and stock-based compensation plans activity. The amounts were not material in 2015 and 2016.
Schedule of deferred tax assets and liabilities
The net deferred tax assets recognized in our consolidated balance sheets in other assets as of December 31 relate to the following: 
(in millions)
2016
 
2017
Deferred tax liabilities
 
 
 
Property and equipment
$
(39.2
)
 
$
(35.3
)
Net unrealized holding gains recognized in income
(43.2
)
 
(53.9
)
Net unrealized holding gains on investments held as available-for-sale
(33.4
)
 
(3.1
)
Other
(27.5
)
 
(18.9
)
 
(143.3
)
 
(111.2
)
Deferred tax assets
 
 
 
Stock-based compensation
165.1

 
92.7

Asset impairments
16.1

 
8.8

Accrued compensation
5.6

 
4.4

Supplemental savings plan
58.3

 
66.6

Currency translation adjustment
23.0

 
2.2

Other
7.7

 
6.8

 
275.8

 
181.5

Net deferred tax asset
$
132.5

 
$
70.3

Schedule of unrecognized tax benefits
The following table summarizes the changes in our unrecognized tax benefits. 
(in millions)
2015
 
2016
 
2017
Balance at beginning of year
$
5.6

 
$
5.8

 
$
6.2

Changes in tax positions related to
 
 
 
 
 
Current year
.7

 
.6

 
1.5

Prior years
1.8

 

 
.1

Expired statute of limitations
(2.3
)
 
(.2
)
 
(.2
)
Balance at end of year
$
5.8

 
$
6.2

 
$
7.6