A thermoplastic composition comprising: a polycarbonate comprising: 25 to 100 mole percent of a first carbonate unit derived from a cyclohexylidene-bridged alkyl-substituted carbonate unit having the formula: wherein R a' and R b' are each independently C 1-12 alkyl, R g is C 1-12 alkyl or halogen, r and s are each independently 1 to 4, and t is 0 to 10, provided that at least one of each of R a' and R b' is disposed meta to the cyclohexylidene bridge; and 0 to 75 mole percent of a second carbonate unit derived from a dihydroxy aromatic compound, wherein the first carbonate unit and second carbonate unit are not identical, and wherein the mole percentages of each of the first carbonate unit and the second carbonate unit are based on the total number of moles of first carbonate unit and second carbonate unit; a polysiloxane-polycarbonate copolymer comprising 0.15 to 30 weight percent of a polysiloxane block comprising siloxane units of the formula wherein E is on average 4 to 60 units, and each occurrence of R is the same or different and is a C 1-13 monovalent organic group, and 70 to 99.85 weight percent of a third carbonate unit derived from a dihydroxy aromatic compound, wherein the weight percentages of each of the polysiloxane block and the third carbonate unit are based on the total weight of polysiloxane block and third carbonate unit, wherein an article having a thickness of 3.2 mm and molded from the thermoplastic composition has a Dynatup total energy greater than 50 Joules, as measured at a constant speed of 3.3 to 3.6 m/min at 23°C according to ASTM D3763-02. a polycarbonate comprising: 25 to 100 mole percent of a first carbonate unit derived from a cyclohexylidene-bridged alkyl-substituted carbonate unit having the formula: wherein R a' and R b' are each independently C 1-12 alkyl, R g is C 1-12 alkyl or halogen, r and s are each independently 1 to 4, and t is 0 to 10, provided that at least one of each of R a' and R b' is disposed meta to the cyclohexylidene bridge; and 0 to 75 mole percent of a second carbonate unit derived from a dihydroxy aromatic compound, wherein the first carbonate unit and second carbonate unit are not identical, and wherein the mole percentages of each of the first carbonate unit and the second carbonate unit are based on the total number of moles of first carbonate unit and second carbonate unit; 25 to 100 mole percent of a first carbonate unit derived from a cyclohexylidene-bridged alkyl-substituted carbonate unit having the formula: wherein R a' and R b' are each independently C 1-12 alkyl, R g is C 1-12 alkyl or halogen, r and s are each independently 1 to 4, and t is 0 to 10, provided that at least one of each of R a' and R b' is disposed meta to the cyclohexylidene bridge; and 0 to 75 mole percent of a second carbonate unit derived from a dihydroxy aromatic compound, wherein the first carbonate unit and second carbonate unit are not identical, and wherein the mole percentages of each of the first carbonate unit and the second carbonate unit are based on the total number of moles of first carbonate unit and second carbonate unit; a polysiloxane-polycarbonate copolymer comprising 0.15 to 30 weight percent of a polysiloxane block comprising siloxane units of the formula wherein E is on average 4 to 60 units, and each occurrence of R is the same or different and is a C 1-13 monovalent organic group, and 70 to 99.85 weight percent of a third carbonate unit derived from a dihydroxy aromatic compound, wherein the weight percentages of each of the polysiloxane block and the third carbonate unit are based on the total weight of polysiloxane block and third carbonate unit, 0.15 to 30 weight percent of a polysiloxane block comprising siloxane units of the formula wherein E is on average 4 to 60 units, and each occurrence of R is the same or different and is a C 1-13 monovalent organic group, and 70 to 99.85 weight percent of a third carbonate unit derived from a dihydroxy aromatic compound, wherein the weight percentages of each of the polysiloxane block and the third carbonate unit are based on the total weight of polysiloxane block and third carbonate unit,