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Significant Accounting Policies Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Net gains on sale and disposal of property [Table Text Block] | The amount of gains and losses for the years ended December 31 was as follows:
(in millions) | 2015 |  | 2014 |  | 2013
Gains on the sale of property | $ | 1.1 |  |  | $ | 1.8 |  |  | $ | 5.5 |
Losses on the sale and disposal of property | (2.0 | ) |  | (0.5 | ) |  | (0.1 | )
Net gains (losses) on sale and disposal of property | $ | (0.9 | ) |  | $ | 1.3 |  |  | $ | 5.4 |

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