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Segment Information - Revenue, Properties and Outsourcing Assets by Geographic Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 497.0	$ 464.6	$ 1,463.0	$ 1,457.8
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	210.3	217.4	627.0	630.6
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	60.4	54.9	175.7	228.4
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 226.3	$ 192.3	$ 660.3	$ 598.8

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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