| Document And Entity Information | Aug. 08, 2019 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 8, 2019 |
| Entity Registrant Name | SS&C Technologies Holdings Inc |
| Entity Central Index Key | 0001402436 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-34675 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 71-0987913 |
| Entity Address, Address Line One | 80 Lamberton Road |
| Entity Address, City or Town | Windsor |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06095 |
| City Area Code | 860 |
| Local Phone Number | 298-4500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Security12b Title | Common stock, par value $0.01 per share |
| Trading Symbol | SSNC |
| Security Exchange Name | NASDAQ |
