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Significant Accounting Policies Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Accounting Policies [Abstract] |
Gain and losses recognized on the sale and disposal of property | The amount of gains and losses for the years ended December 31 was as follows:
(in millions) | 2012 |  | 2011 |  | 2010
Gains on the sale of property | $ | 6.2 |  |  | $ | 18.7 |  |  | $ | 4.9 |
Losses on the sale and disposal of property | (1.3 | ) |  | (2.7 | ) |  | (9.9 | )
Net gains (losses) on sale and disposal of property | $ | 4.9 |  |  | $ | 16.0 |  |  | $ | (5.0 | )

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- Definition Tabular disclosure of the gains and losses on sale and disposal of property. + References No definition available. + Details
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