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Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |
Estimated Future Settlement Of Existing Claims [Table Text Block] |
| December 31,
(millions of dollars) | 2016 |  | 2015
Assets: |  |  |  |  |
Non-current assets | $ | 386.4 |  |  | $ | 277.3 |
Total insurance assets | $ | 386.4 |  |  | $ | 277.3 |
Liabilities: |  |  |  |  |
Accounts payable and accrued expenses | $ | 51.7 |  |  | $ | 47.7 |
Other non-current liabilities | 827.6 |  |  | 60.8 |
Total accrued liabilities | $ | 879.3 |  |  | $ | 108.5 |

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