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INCOME TAXES. (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedules of provision for income taxes and deferred income taxes (tax benefits) | The deferred income taxes (benefits) recognized as part of our provision for income taxes is related to:
(in millions) | 2018 |  | 2017 |  | 2016
Property and equipment | $ | 11.0 |  |  | $ | (3.9 | ) |  | $ | 3.2 |
Stock-based compensation | 7.1 |  |  | 72.4 |  |  | 1.3 |
Accrued compensation | (2.2 | ) |  | 1.2 |  |  | (1.7 | )
Supplemental savings plan liability | (17.4 | ) |  | (8.3 | ) |  | (30.9 | )
Asset impairments | .9 |  |  | 7.3 |  |  | 10.0 |
Unrealized holding gains recognized in non-operating income | (32.0 | ) |  | 10.7 |  |  | 31.6 |
Other | (2.9 | ) |  | (7.7 | ) |  | — |
Total deferred income taxes (benefits) | $ | (35.5 | ) |  | $ | 71.7 |  |  | $ | 13.5 |
The provision for income taxes consists of:
(in millions) | 2018 |  | 2017 |  | 2016
Current income taxes |  |  |  |  |
U.S. federal | $ | 484.2 |  |  | $ | 708.1 |  |  | $ | 573.7 |
State and local | 138.7 |  |  | 131.0 |  |  | 105.8 |
Foreign | 28.5 |  |  | 13.1 |  |  | 13.5 |
Deferred income taxes (benefits) | (35.5 | ) |  | 71.7 |  |  | 13.5 |
Total | $ | 615.9 |  |  | $ | 923.9 |  |  | $ | 706.5 |
Schedule of effective income tax rate reconciliation | The following table reconciles the statutory federal income tax rate to our effective income tax rate.
| 2018 |  | 2017 |  | 2016
Statutory U.S. federal income tax rate | 21.0 | % |  | 35.0 | % |  | 35.0 | %
Impact of nonrecurring charge relating to U.S. tax reform | .8 |  |  | 2.9 |  |  | — |
Impact of nonrecurring charge related to Maryland state tax legislation | .3 |  |  | — |  |  | — |
State income taxes for current year, net of federal income tax benefits(1) | 4.6 |  |  | 3.9 |  |  | 3.8 |
Net income attributable to redeemable non-controlling interests | .7 |  |  | (1.3 | ) |  | (.7 | )
Net excess tax benefits from stock-based compensation plans activity | (1.7 | ) |  | (3.0 | ) |  | (1.7 | )
Other items | .1 |  |  | (.6 | ) |  | (.4 | )
Effective income tax rate | 25.8 | % |  | 36.9 | % |  | 36.0 | %
(1) State income tax benefits are reflected in the total benefits for net income attributable to redeemable non-controlling interests and stock-based compensation plans activity.
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) | 2018 |  | 2017
Deferred tax liabilities |  |  |
Property and equipment | $ | (46.3 | ) |  | $ | (35.3 | )
Net unrealized holding gains recognized in income | (30.1 | ) |  | (53.9 | )
Net unrealized holding gains on investments held as available-for-sale | — |  |  | (3.1 | )
Other | (20.4 | ) |  | (18.9 | )
| (96.8 | ) |  | (111.2 | )
Deferred tax assets |  |  |
Stock-based compensation | 85.6 |  |  | 92.7 |
Asset impairments | 7.9 |  |  | 8.8 |
Accrued compensation | 6.6 |  |  | 4.4 |
Supplemental savings plan | 84.0 |  |  | 66.6 |
Currency translation adjustment | 11.4 |  |  | 2.2 |
Other | 11.2 |  |  | 6.8 |
| 206.7 |  |  | 181.5 |
Net deferred tax asset | $ | 109.9 |  |  | $ | 70.3 |
Schedule of unrecognized tax benefits | The following table summarizes the changes in our unrecognized tax benefits.
(in millions) | 2018 |  | 2017 |  | 2016
Balance at beginning of year | $ | 7.6 |  |  | $ | 6.2 |  |  | $ | 5.8 |
Changes in tax positions related to |  |  |  |  |
Current year | 5.8 |  |  | 1.5 |  |  | .6 |
Prior years | 3.8 |  |  | .1 |  |  | — |
Expired statute of limitations | (1.1 | ) |  | (.2 | ) |  | (.2 | )
Balance at end of year | $ | 16.1 |  |  | $ | 7.6 |  |  | $ | 6.2 |

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