Employee Benefits - Schedule of net liability for defined benefit plans presented within Other non-current liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Present value of funded obligations	$ (209.2)	$ (182.9)
Fair value of defined benefit plan assets	223.9	188.2
Net asset/(liability)	$ 14.7	$ 5.3

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Name:	us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant