Segment Reporting (Summary of the Impact on the Adjusted EBITDA) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Increase (decrease) to revenue	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Increase (decrease) to Adjusted EBITDA	0.0	0.0	0.0	0.0
Increase (decrease) to property and equipment additions	0.0	0.0	0.0	0.0
Central and Other
Segment Reporting Information [Line Items]
Increase (decrease) to revenue	65.4	60.9	184.0	180.8
Increase (decrease) to Adjusted EBITDA	40.0	29.2	118.5	91.7
Increase (decrease) to property and equipment additions	0.0	0.0	0.0	0.0
Intersegment eliminations
Segment Reporting Information [Line Items]
Increase (decrease) to revenue	(65.4)	(60.9)	(184.0)	(180.8)
Increase (decrease) to Adjusted EBITDA	(15.4)	(14.1)	(45.6)	(44.7)
Increase (decrease) to property and equipment additions	(15.4)	(14.1)	(45.6)	(44.7)
Operating Segments | Switzerland
Segment Reporting Information [Line Items]
Increase (decrease) to Adjusted EBITDA	(16.4)	(9.7)	(48.3)	(29.9)
Increase (decrease) to property and equipment additions	5.8	5.3	17.0	16.7
Operating Segments | Belgium
Segment Reporting Information [Line Items]
Increase (decrease) to Adjusted EBITDA	(2.2)	(2.1)	(6.6)	(6.5)
Increase (decrease) to property and equipment additions	7.0	6.4	20.8	20.4
Operating Segments | Ireland
Segment Reporting Information [Line Items]
Increase (decrease) to Adjusted EBITDA	(6.0)	(3.3)	(18.0)	(10.6)
Increase (decrease) to property and equipment additions	$ 2.6	$ 2.4	$ 7.8	$ 7.6