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Significant Accounting Policies Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
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) | 2021 |  | 2020 |  | 2019
Gains on the sale of property | $ | 1.4 |  |  | $ | 0.7 |  |  | $ | 1.8 |
Losses on the sale and disposal of property | (0.9) |  |  | (0.5) |  |  | (2.4) |
Net gains (losses) on sale and disposal of property | $ | 0.5 |  |  | $ | 0.2 |  |  | $ | (0.6) |

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