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Pension and Other Post-Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2013
Defined benefit pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated contributions in the next fiscal year |  | $ 2.9 |  |
Accumulated benefit obligation |  | 115.0 | $ 124.9 |
Underfunded status of plan |  | $ 10.5 | $ 20.2 |
U.K. Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Decrease in benefit obligation due to plan amendment | $ 5.8 |  |  |
Maximum increase in pensionable earnings | 2.00% |  |  |
Funded percentage (less than 100%) |  |  |  | 100.00%
Global return fund | U.K. Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 30.00% |  |
Long lease property | U.K. Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 16.00% |  |
Corporate bonds | U.K. Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 9.00% |  |
Corporate bonds | Canadian Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 40.00% |  |
U.K | Equity securities | U.K. Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 25.00% |  |
Canada | Equity securities | Canadian Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 20.00% |  |
Other foreign countries | Equity securities | U.K. Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 20.00% |  |
Other foreign countries | Equity securities | Canadian Plan |  |  |  |
Target allocations of plan assets |  |  |  |
Target allocation in debt securities (as a percent) |  | 40.00% |  |

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- Definition Defined Benefit Plan, Plan Amendmants, Maximum Annual Increase for Pensionable Earnings While Plan is Not 100 Percent Funded + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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