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Significant Accounting Policies Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Net Gains (Losses) on Sale and Disposal of Property [Table Text Block] | The amount of gains and losses for the years ended December 31 were as follows:
(in millions) | 2016 |  | 2015 |  | 2014
Gains on the sale of property | $ | 0.5 |  |  | $ | 1.1 |  |  | $ | 1.8 |
Losses on the sale and disposal of property | (0.6 | ) |  | (2.0 | ) |  | (0.5 | )
Net gains (losses) on sale and disposal of property | $ | (0.1 | ) |  | $ | (0.9 | ) |  | $ | 1.3 |

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- References No definition available. + Details
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