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INCOME TAXES. (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedules of provision for income taxes and deferred income taxes (tax benefits) | The provision for income taxes consists of:
(in millions) | 2020 |  | 2019 |  | 2018
Current income taxes |  |  |  |  |
U.S. federal | $ | 547.1 |  |  | $ | 490.9 |  |  | $ | 484.2 |
State and local | 135.2 |  |  | 135.9 |  |  | 138.7 |
Foreign | 22.9 |  |  | 18.3 |  |  | 28.5 |
Deferred income taxes (benefits) | 13.7 |  |  | 33.3 |  |  | (35.5) |
Total | $ | 718.9 |  |  | $ | 678.4 |  |  | $ | 615.9 |
The deferred income taxes (benefits) recognized as part of our provision for income taxes is related to:
(in millions) | 2020 |  | 2019 |  | 2018
Property and equipment | $ | 15.6 |  |  | $ | 3.0 |  |  | $ | 11.0 |
Asset impairments | 2.9 |  |  | (2.4) |  |  | .9 |
Stock-based compensation | 1.8 |  |  | 4.5 |  |  | 7.1 |
Accrued compensation | (2.2) |  |  | 1.3 |  |  | (2.2) |
Supplemental savings plan liability | (43.3) |  |  | (33.6) |  |  | (17.4) |
Unrealized holding gains recognized in non-operating income | 46.8 |  |  | 63.0 |  |  | (32.0) |
Other | (7.9) |  |  | (2.5) |  |  | (2.9) |
Total deferred income taxes (benefits) | $ | 13.7 |  |  | $ | 33.3 |  |  | $ | (35.5) |
Schedule of effective income tax rate reconciliation | The following table reconciles the statutory federal income tax rate to our effective income tax rate.
| 2020 |  | 2019 |  | 2018
Statutory U.S. federal income tax rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Nonrecurring charge relating to U.S. tax reform | — |  |  | — |  |  | .8 |
Nonrecurring charge related to Maryland state tax legislation | — |  |  | — |  |  | .3 |
State income taxes for current year, net of federal income tax benefits(1) | 3.8 |  |  | 4.3 |  |  | 4.6 |
Net income attributable to redeemable non-controlling interests | (1.2) |  |  | (1.0) |  |  | .7 |
Net excess tax benefits from stock-based compensation plans activity | (1.9) |  |  | (1.5) |  |  | (1.7) |
Other items | .5 |  |  | .4 |  |  | .1 |
Effective income tax rate | 22.2 | % |  | 23.2 | % |  | 25.8 | %
(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) | 2020 |  | 2019
Deferred tax assets |  |  |
Stock-based compensation | $ | 79.3 |  |  | $ | 81.1 |
Asset impairments | 7.4 |  |  | 10.3 |
Operating lease liabilities | 34.9 |  |  | 33.9 |
Accrued compensation | 7.5 |  |  | 5.3 |
Supplemental savings plan | 160.9 |  |  | 117.6 |
Currency translation adjustment | .2 |  |  | 11.9 |
Other | 13.5 |  |  | 15.4 |
| 303.7 |  |  | 275.5 |
Deferred tax liabilities |  |  |
Property and equipment | (64.9) |  |  | (49.3) |
Operating lease assets | (34.9) |  |  | (33.9) |
Net unrealized holding gains recognized in income | (130.9) |  |  | (93.1) |
Net unrealized holding gains on investments held as available-for-sale | — |  |  | — |
Other | (12.4) |  |  | (22.1) |
| (243.1) |  |  | (198.4) |
Net deferred tax asset | $ | 60.6 |  |  | $ | 77.1 |
Schedule of unrecognized tax benefits | The following table summarizes the changes in our unrecognized tax benefits.
(in millions) | 2020 |  | 2019 |  | 2018
Balance at beginning of year | $ | 23.9 |  |  | $ | 16.1 |  |  | $ | 7.6 |
Changes in tax positions related to |  |  |  |  |
Current year | 7.7 |  |  | 8.1 |  |  | 5.8 |
Prior years | (2.6) |  |  | .5 |  |  | 3.8 |
Expired statute of limitations | (2.3) |  |  | (.8) |  |  | (1.1) |
Balance at end of year | $ | 26.7 |  |  | $ | 23.9 |  |  | $ | 16.1 |

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