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Pension plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net benefit obligations | $ 40.0 | $ 55.3 |  |
Defined benefit pension charge (credit) | (4.0) | (3.4) | $ 3.5 |
Defined benefit pension (credit) charge | (4.7) | (4.2) | 2.8 |
Defined benefit plan, expected amortization, next fiscal year | 2.3 |  |  |
Defined benefit plan, expected amortization of gain (loss), next fiscal year | 2.7 |  |  |
Defined benefit plan, expected amortization of prior service credit | 0.4 |  |  |
Allowance included in benefit obligation | 2.2 | 0.0 |  |
Expected future employer contributions, next fiscal year | 7.5 |  |  |
Employer contribution amount | 7.9 |  |  |
U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for benefit settlement. annuities purchased |  |  | 10.0 |
Benefit liabilities settlement charge (credit), annuities purchased |  |  | 0.1 |
Payment for benefit settlement, lump sum paid |  |  | 4.2 |
Benefit liabilities settlement credit, lump sum paid |  |  | 0.7 |
Gross benefit amounts settled, annuities purchased |  |  | 14.8 |
Gross benefit amounts settled, lump sum paid |  |  | 14.2 |
U.K. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net benefit obligations | 31.8 | 43.4 |  |
Defined benefit pension charge (credit) | (4.1) | (3.9) | (1.5) |
Allowance included in benefit obligation | 2.2 | 0.0 |  |
Curtailment credit |  |  |  | $ 3.3
Past service credit |  |  |  | $ 14.9
Selling, General and Administrative Expenses |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit pension charge (credit) | $ 0.7 | $ 0.8 | $ 0.7 |

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- Definition Defined Benefit Plan, Benefit Obligation, Settlement Charge (Credit). Annuities Purchased, Lump Sum Paid + References No definition available. + Details
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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 + Details
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