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Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Common stock, par value (in dollars per share) | $ 1.00 | $ 1.00
Common shares, shares authorized | 1,000.0 | 1,000.0
Common shares, shares issued | 246.7 | 243.9
Common shares, shares outstanding | 246.7 | 243.9
Treasury shares | 11.1 | 2.0

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