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Pension and Non-pension Post-employment Benefit Plans - Additional Information (Details) £ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 USD ($) | Apr. 30, 2017 GBP (£) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Percentage of plan members that are active employees of the Company |  |  |  |  | 1.00% |  |
Loss (gain) on pension annuity purchase | $ 1,900,000 |  |  |  | $ 1,900,000 | $ 0 | $ (300,000)
Plan assets, at fair value |  |  |  |  | $ 395,500,000 | 377,200,000 |
Percentage of plan assets held with financial institutions with a rating of A- or above |  |  |  |  | 96.00% |  |
Level 1 |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  | $ 247,000,000 | 351,600,000 |
Level 3 |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  | 148,500,000 | 0 |
Level 2 |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  | 0 | 25,600,000 |
UK Main Pension Plan |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Cost of annuity purchased |  |  | $ 154,300,000 | £ 123.7 |  |  |
Non-cash loss recorded in other comprehensive income |  |  | $ 17,000,000 |  |  |  |
Reduction in pension assets |  |  |  |  | 17,000,000 |  |
UK Supplementary Pension Plan |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Cost of annuity purchased | $ 11,700,000 | £ 9.1 |  |  |  |  |
Loss (gain) on pension annuity purchase |  |  |  |  | 1,900,000 |  |
Pension Plans |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  | 395,500,000 | 377,200,000 |
Employer contributions |  |  |  |  | 11,900,000 | 19,400,000 |
Defined Contribution Pension Plans |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Employer contributions |  |  |  |  | 9,400,000 | 10,000,000 |
Estimate of contributions expected to be paid to plan for next annual reporting period |  |  |  |  | 9,400,000 |  |
Defined Benefit Pension Plans |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Employer contributions |  |  |  |  | 2,500,000 | 9,400,000 |
Estimate of contributions expected to be paid to plan for next annual reporting period |  |  |  |  | 2,500,000 |  |
Other Benefit Plans |  |  |  |  |  |  |
Disclosure of fair value of plan assets [line items] |  |  |  |  |  |  |
Plan assets, at fair value |  |  |  |  | 0 | 0 |
Employer contributions |  |  |  |  | 4,500,000 | $ 2,200,000 |
Estimate of contributions expected to be paid to plan for next annual reporting period |  |  |  |  | $ 4,200,000 |  |

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- Definition Gain (Loss) on Purchase of Annuity Recognised in Profit Or Loss + References No definition available. + Details
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- Definition Number of Participants Of Retirement Benefit Plan Receiving Benefits, Percentage + References No definition available. + Details
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