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Significant Accounting Policies Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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) | 2017 |  | 2016 |  | 2015
Gains on the sale of property | $ | 0.7 |  |  | $ | 0.4 |  |  | $ | 1.1 |
Losses on the sale and disposal of property | (2.3 | ) |  | (0.5 | ) |  | (2.0 | )
Net losses on sale and disposal of property | $ | (1.6 | ) |  | $ | (0.1 | ) |  | $ | (0.9 | )

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