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Pension and Other Post-Retirement Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
U.K. Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | $ 64.7 | $ 63.7 |
U.K. Plan | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 0.2 | 0.3 |
U.K. Plan | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 51.7 | 50.9 |
U.K. Plan | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 12.9 | 12.5 | $ 11.8
U.K. Plan | Global return fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 19.3 | 19.3 |
U.K. Plan | Global return fund | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 19.4 | 19.3 |
U.K. Plan | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 6.1 | 6.1 |
U.K. Plan | Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 6.1 | 6.1 |
U.K. Plan | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 12.9 | 12.5 |
U.K. Plan | Real estate | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 12.9 | 12.5 |
U.K. Plan | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 0.2 | 0.3 |
U.K. Plan | Cash | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 0.2 | 0.3 |
U.K. Plan | U.K | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 15.8 | 15.2 |
U.K. Plan | U.K | Equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 15.8 | 15.2 |
U.K. Plan | Other foreign countries | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 10.4 | 10.3 |
U.K. Plan | Other foreign countries | Equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 10.4 | 10.3 |
Canadian Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 39.8 | 42.9 |
Canadian Plan | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 25.8 | 26.7 |
Canadian Plan | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 14.0 | 16.2 |
Canadian Plan | Government bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 5.7 | 6.5 |
Canadian Plan | Government bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 5.7 | 6.5 |
Canadian Plan | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets |  | 9.1 |
Canadian Plan | Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets |  | 9.1 |
Canadian Plan | Other short-term investment |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 1.2 | 0.4 |
Canadian Plan | Other short-term investment | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 1.2 | 0.4 |
Canadian Plan | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 0.2 | 0.3 |
Canadian Plan | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 0.2 | 0.3 |
Canadian Plan | Canada | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 7.0 | 7.9 |
Canadian Plan | Canada | Equity securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 6.3 | 7.3 |
Canadian Plan | Canada | Equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 0.7 | 0.6 |
Canadian Plan | Canada | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 7.6 |  |
Canadian Plan | Canada | Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 7.6 |  |
Canadian Plan | Other foreign countries | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 18.1 | 18.7 |
Canadian Plan | Other foreign countries | Equity securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | $ 18.1 | $ 18.7 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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