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Cover Page - USD ($)
 12 Months Ended
Jun. 30, 2020
Aug. 24, 2020
Dec. 31, 2019
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 30, 2020    
Document Transition Report false    
Entity File Number 1-5828    
Entity Registrant Name CARPENTER TECHNOLOGY CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 23-0458500    
Entity Address, Address Line One 1735 Market Street    
Entity Address, Address Line Two 15th Floor    
Entity Address, City or Town Philadelphia    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19103    
City Area Code 610    
Local Phone Number 208-2000    
Title of 12(b) Security Common Stock, $5 Par Value    
Trading Symbol CRS    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2,379,338,145
Entity Common Stock, Shares Outstanding   47,946,758  
Documents Incorporated by Reference
Selected portions of the Company’s fiscal year 2020 definitive Proxy Statement are incorporated by reference into Part III of this Report.
    
Entity Central Index Key 0000017843    
Current Fiscal Year End Date --06-30    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false