| **Restructuring (Tables)**                          | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Restructuring and Related Activities [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Summary of Activity in Restructuring Accounts       | A summary of the activity in the restructuring accounts for the nine months ended September 30, 2014 was as follows:(in millions of dollars)Balance at December 31, 2013 Provision CashExpenditures Non-cashItems/Currency Change Balance at September 30, 2014Employee termination costs$19.1 $0.7 $(13.7) $(0.2) $5.9Termination of lease agreements1.4 0.6 (1.4) — 0.6Asset impairments/net loss on disposal of assets resulting from restructuring activities— 0.2 0.1 (0.3) —Other— 0.1 (0.1) — —Total restructuring liability$20.5 $1.6 $(15.1) $(0.5) $6.5 |

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| - Definition
Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747
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