Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt - 2020 Issuance (Details) - Unsecured debt - EUR (€)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Oct. 31, 2013	Jun. 30, 2012
Line of Credit Facility [Line Items]
Debt instrument, face amount				€ 355,000,000	€ 325,000,000
5.75% 2020 Private Placement Notes due 2025
Line of Credit Facility [Line Items]
Debt instrument, face amount			€ 200,000,000
Interest rate, stated percentage	5.75%	5.75%	5.75%