Segment Reporting (Revenue and Long-Lived Assets by Geographic Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 7,491.4	$ 7,195.7	$ 10,311.3
Long-lived assets	19,893.8	18,166.0
Operating Segments | Switzerland
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,380.4	3,180.9	3,321.9
Long-lived assets	11,604.0	10,950.4
Operating Segments | Belgium
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,948.2	2,807.3	3,065.9
Long-lived assets	7,087.6	5,779.0
Operating Segments | Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	506.1	494.7	550.0
Long-lived assets	932.0	813.2
Operating Segments | U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	0.0	0.0	2,736.4
Operating Segments | Slovakia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	51.8	49.9	52.3
Long-lived assets	118.2	116.5
Operating Segments | Other, including intersegment eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	270.9	600.9
Geography Eliminations | Other, including intersegment eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	604.9	662.9	584.8
Intersegment eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(260.0)	(247.1)	$ (278.3)
Long-lived assets	$ (118.9)	$ (94.0)