Property, Plant and Equipment - Components of property, plant, and equipment, net (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Land	$ 202.4		$ 202.4
Buildings	1,601.3		1,592.9
Leasehold improvements	135.7		107.7
Machinery and equipment	1,703.8		1,611.5
Computer software and hardware	1,032.1		999.9
Furniture and fixtures	61.5		61.1
Construction in progress	975.4		888.8
Total cost	5,712.2		5,464.3
Less: accumulated depreciation	(2,402.5)		(2,165.7)
Total property, plant and equipment, net	$ 3,309.7		$ 3,298.6
125 Broadway Building
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, net		$ 79.2
125 Broadway Building | Buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, net		72.6
125 Broadway Building | Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, net		1.6
125 Broadway Building | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, net		$ 5.0