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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule Of Stock Repurchase Activities | The following table provides the stock repurchase activities during the years ended December 31, 2017, 2016, and 2015 (in millions, except per share amounts):
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Shares repurchased | 7.3 |  |  | 0.2 |  |  | 1.1 |
Average price per share | $ | 310.32 |  |  | $ | 201.70 |  |  | $ | 167.41 |
Value of shares repurchased | $ | 2,274.0 |  |  | $ | 42.5 |  |  | $ | 183.7 |
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, 2017, and 2016, are as follows (in millions):
| Year Ended December 31, 2017
| Gains (Losses) on Hedge Instruments |  | Unrealized Gains (Losses) on Available-for-Sale Securities |  | Foreign Currency Translation Gains (Losses) |  | Employee Benefit Plans |  | Total
Beginning balance | $ | 5.0 |  |  | $ | (8.6 | ) |  | $ | (1.3 | ) |  | $ | (4.0 | ) |  | $ | (8.9 | )
Other comprehensive income (loss) before reclassifications | (8.6 | ) |  | (2.7 | ) |  | 3.6 |  |  | (0.3 | ) |  | (8.0 | )
Reclassified from accumulated other comprehensive loss | 1.2 |  |  | — |  |  | — |  |  | 0.2 |  |  | 1.4 |
Net current-period other comprehensive income (loss) | (7.4 | ) |  | (2.7 | ) |  | 3.6 |  |  | (0.1 | ) |  | (6.6 | )
Ending balance | $ | (2.4 | ) |  | $ | (11.3 | ) |  | $ | 2.3 |  |  | $ | (4.1 | ) |  | $ | (15.5 | )
| Year Ended December 31, 2016
| Gains (Losses) on Hedge Instruments |  | Unrealized Gains (Losses) on Available-for-Sale Securities |  | Foreign Currency Translation Gains (Losses) |  | Employee Benefit Plans |  | Total
Beginning balance | $ | 1.5 |  |  | $ | (4.2 | ) |  | $ | (3.3 | ) |  | $ | (3.5 | ) |  | $ | (9.5 | )
Other comprehensive income (loss) before reclassifications | 4.1 |  |  | (4.6 | ) |  | 2.0 |  |  | (0.7 | ) |  | 0.8 |
Reclassified from accumulated other comprehensive loss | (0.6 | ) |  | 0.2 |  |  | — |  |  | 0.2 |  |  | (0.2 | )
Net current-period other comprehensive income (loss) | 3.5 |  |  | (4.4 | ) |  | 2.0 |  |  | (0.5 | ) |  | 0.6 |
Ending balance | $ | 5.0 |  |  | $ | (8.6 | ) |  | $ | (1.3 | ) |  | $ | (4.0 | ) |  | $ | (8.9 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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