| Cover Page Cover Page | Jan. 25, 2021 | Oct. 26, 2020 |
| Cover [Abstract] | ||
| Document Type | false | |
| Document Period End Date | Jan. 25, 2021 | |
| Entity Registrant Name | CRANE CO. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 1-1657 | |
| Entity Tax Identification Number | 13-1952290 | |
| Entity Address, Address Line One | 100 First Stamford Place | |
| Entity Address, City or Town | Stamford | |
| Entity Address, State or Province | CT | |
| Entity Address, Postal Zip Code | 06902 | |
| City Area Code | 203 | |
| Local Phone Number | 363-7300 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Entity Emerging Growth Company | false | |
| Title of 12(b) Security | Common Stock, par value $1.00 | |
| Trading Symbol | CR | |
| Security Exchange Name | NYSE | |
| Entity Central Index Key | 0000025445 | |
| Amendment Flag | false | |
| Document Type | 8-K |
