Revenue Recognition Disaggregation of Revenue by type of activity and reporting segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Inter-segment revenue elimination	$ (5.0)	$ (3.0)	$ (11.0)	$ (6.0)
Net revenue	1,217.0	911.0	2,242.0	1,757.0
Biologics
Disaggregation of Revenue [Line Items]
Net revenue	638.0	404.0	1,184.0	781.0
Biologics | Manufacturing & Commercial Product Supply
Disaggregation of Revenue [Line Items]
Net revenue	169.0	124.0	303.0	214.0
Biologics | Development Services
Disaggregation of Revenue [Line Items]
Net revenue	469.0	280.0	881.0	567.0
Biologics | Clinical Supply Services
Disaggregation of Revenue [Line Items]
Net revenue	0.0	0.0	0.0	0.0
Softgel and Oral Technologies
Disaggregation of Revenue [Line Items]
Net revenue	329.0	247.0	572.0	468.0
Softgel and Oral Technologies | Manufacturing & Commercial Product Supply
Disaggregation of Revenue [Line Items]
Net revenue	289.0	214.0	496.0	405.0
Softgel and Oral Technologies | Development Services
Disaggregation of Revenue [Line Items]
Net revenue	40.0	33.0	76.0	63.0
Softgel and Oral Technologies | Clinical Supply Services
Disaggregation of Revenue [Line Items]
Net revenue	0.0	0.0	0.0	0.0
Oral and Specialty Drug Delivery
Disaggregation of Revenue [Line Items]
Net revenue	156.0	170.0	302.0	328.0
Oral and Specialty Drug Delivery | Manufacturing & Commercial Product Supply
Disaggregation of Revenue [Line Items]
Net revenue	96.0	114.0	184.0	217.0
Oral and Specialty Drug Delivery | Development Services
Disaggregation of Revenue [Line Items]
Net revenue	60.0	56.0	118.0	111.0
Oral and Specialty Drug Delivery | Clinical Supply Services
Disaggregation of Revenue [Line Items]
Net revenue	0.0	0.0	0.0	0.0
Clinical Supply Services
Disaggregation of Revenue [Line Items]
Net revenue	99.0	93.0	195.0	186.0
Clinical Supply Services | Manufacturing & Commercial Product Supply
Disaggregation of Revenue [Line Items]
Net revenue	0.0	0.0	0.0	0.0
Clinical Supply Services | Development Services
Disaggregation of Revenue [Line Items]
Net revenue	0.0	0.0	0.0	0.0
Clinical Supply Services | Clinical Supply Services
Disaggregation of Revenue [Line Items]
Net revenue	99.0	93.0	195.0	186.0
Total Catalent before inter-segment revenue elimination
Disaggregation of Revenue [Line Items]
Net revenue	1,222.0	914.0	2,253.0	1,763.0
Total Catalent before inter-segment revenue elimination | Manufacturing & Commercial Product Supply
Disaggregation of Revenue [Line Items]
Net revenue	554.0	452.0	983.0	836.0
Total Catalent before inter-segment revenue elimination | Development Services
Disaggregation of Revenue [Line Items]
Net revenue	569.0	369.0	1,075.0	741.0
Total Catalent before inter-segment revenue elimination | Clinical Supply Services
Disaggregation of Revenue [Line Items]
Net revenue	$ 99.0	$ 93.0	$ 195.0	$ 186.0