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Income Taxes Schedule of Unrecognized Tax Benefits Activity (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Unrecognized Tax Benefits Activity [Table Text Block] | The table below summarizes the activity related to our unrecognized tax benefits.
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 345.3 |  |  | $ | 335.4 |  |  | $ | 271.9 |
Increases as a result of tax positions taken during a prior year | 18.1 |  |  | 22.7 |  |  | 65.9 |
Decreases as a result of tax positions taken during a prior year | (165.7) |  |  | (25.8) |  |  | (10.8) |
Settlements with taxing authorities | (6.2) |  |  | (8.1) |  |  | (6.5) |
Lapse of statutes of limitation | (0.7) |  |  | (0.6) |  |  | (1.7) |
Increases as a result of tax positions taken during the current year | 26.8 |  |  | 21.7 |  |  | 16.6 |
Balance at end of period | $ | 217.6 |  |  | $ | 345.3 |  |  | $ | 335.4 |

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