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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive income (loss), net of income taxes, for the years ended December 31, 2017 and 2016 were (in millions):
| Cash Flow Hedge |  | Available-for-Sale Securities |  | Defined Benefit Pension Plans and Postemployment Arrangements |  | Foreign Currency Translation |  | Total
January 1, 2016 | $ | (3.3 | ) |  | $ | (0.9 | ) |  | $ | (87.9 | ) |  | $ | (923.3 | ) |  | $ | (1,015.4 | )
Other comprehensive income (loss) before reclassifications | (28.5 | ) |  | 0.1 |  |  | (11.0 | ) |  | (311.8 | ) |  | (351.2 | )
Reclassification from accumulated other comprehensive income (loss) | 2.3 |  |  | — |  |  | 8.3 |  |  | — |  |  | 10.6 |
December 31, 2016 | (29.5 | ) |  | (0.8 | ) |  | (90.6 | ) |  | (1,235.1 | ) |  | (1,356.0 | )
Other comprehensive income (loss) before reclassifications | — |  |  | 0.5 |  |  | (7.2 | ) |  | 387.1 |  |  | 380.4 |
Reclassification from accumulated other comprehensive income (loss) | 3.2 |  |  | — |  |  | 9.4 |  |  | — |  |  | 12.6 |
December 31, 2017 | $ | (26.3 | ) |  | $ | (0.3 | ) |  | $ | (88.4 | ) |  | $ | (848.0 | ) |  | $ | (963.0 | )
In December 2016, we retired 100 million shares of our treasury stock, which reduced the number of common shares issued and treasury shares held. Upon retirement, the excess of the average cost of the treasury stock over the par value of the common stock was charged to retained earnings. Accordingly, the balance sheet at December 31, 2016 reflects a reduction in common stock, retained earnings and treasury stock. The retirement of the treasury stock had no impact on shareholders’ equity or common stock outstanding. The retired treasury shares are included in the authorized but unissued common shares.

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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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