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Significant Accounting Policies Treasury Stock (Policies) | 12 Months Ended
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Dec. 31, 2016
Treasury Stock [Abstract] |
Treasury Stock [Text Block] | Treasury Stock We account for repurchased common stock under the cost method and include such treasury stock as a component of our Consolidated Statements of Stockholders' Equity. Upon retirement, we reduce common stock for the par value of the shares being retired and the excess of the cost of the shares over par value as a reduction to additional paid-in capital ("APIC"), to the extent there is APIC in the same class of stock, and any remaining amount to retained earnings. These retired shares remain authorized but unissued. In October 2016, we retired 13.7 shares of our treasury stock, which resulted in a reduction in common stock of $1.4, treasury stock of $311.0 and APIC of $309.6. In October 2015, we retired 11.3 shares of our treasury stock, which resulted in a reduction in common stock of $1.2, treasury stock of $233.2 and APIC of $232.0. In November 2014, we retired 121.9 shares of our treasury stock, which resulted in a reduction in common stock of $12.2, treasury stock of $1,522.4 and APIC of $1,510.2. There was no effect on total stockholders' equity as a result of these retirements.

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- Definition Treasury Stock [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References No definition available. + Details
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