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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule Of Stock Repurchase Activities | The following table provides the stock repurchase activities during the years ended December 31, 2019, 2018, and 2017 (in millions, except per share amounts):
| Years Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Shares repurchased | 0.6 |  |  | — |  |  | 7.3 |
Average price per share | $ | 481.35 |  |  | $ | — |  |  | $ | 310.32 |
Value of shares repurchased | $ | 269.5 |  |  | $ | — |  |  | $ | 2,274.0 |
Components of Accumulated Other Comprehensive Income (Loss), Net of Tax | The components of accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2019, and 2018, are as follows (in millions):
| Year Ended December 31, 2019 |  |  |  |  |  |  |  |
| Gains (Losses) on Hedge Instruments |  | Unrealized Gains (Losses) on Available-for-Sale Securities |  | Foreign Currency Translation Gains (Losses) |  | Employee Benefit Plans |  | Total
Beginning balance | $ | 0.2 |  |  | $ | (9.8) |  |  | $ | (0.3) |  |  | $ | (3.4) |  |  |  | $ | (13.3) |
Other comprehensive income (loss) before reclassifications | 5.8 |  |  | 30.7 |  |  | 0.3 |  |  | (5.9) |  |  | 30.9 |
Reclassified from accumulated other comprehensive (loss) | (5.3) |  |  | (0.5) |  |  | — |  |  | 0.6 |  |  | (5.2) |
Net current-period other comprehensive income (loss) | 0.5 |  |  | 30.2 |  |  | 0.3 |  |  | (5.3) |  |  | 25.7 |
Ending balance | $ | 0.7 |  |  | $ | 20.4 |  |  | $ | — |  |  | $ | (8.7) |  |  | $ | 12.4 |
| Year Ended December 31, 2018 |  |  |  |  |  |  |  |
| Gains (Losses) on Hedge Instruments |  | Unrealized Gains (Losses) on Available-for-Sale Securities |  | Foreign Currency Translation Gains (Losses) |  | Employee Benefit Plans |  | Total
Beginning balance | $ | (2.4) |  |  | $ | (11.3) |  |  | $ | 2.3 |  |  | $ | (4.1) |  |  | $ | (15.5) |
Other comprehensive income (loss) before reclassifications | 3.6 |  |  | 0.3 |  |  | (2.6) |  |  | 0.4 |  |  | 1.7 |
Reclassified from accumulated other comprehensive income (loss) | (1.0) |  |  | 1.2 |  |  | — |  |  | 0.3 |  |  | 0.5 |
Net current-period other comprehensive income (loss) | 2.6 |  |  | 1.5 |  |  | (2.6) |  |  | 0.7 |  |  | 2.2 |
Ending balance | $ | 0.2 |  |  | $ | (9.8) |  |  | $ | (0.3) |  |  | $ | (3.4) |  |  | $ | (13.3) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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