A planet's Detriment sign is opposite its Rulership sign and its Fall sign is opposite its Exalted sign. Planet Pluto is in Rulership in the SIGN of Scorpio and in its Detriment in Taurus; Pluto is Exalted in Leo and Falls in Aquarius.

Pluto (no matter what sign) is in Accidental Dignity in 8 house and Accidental Detriment in 2 house. Pluto is in its Accidental Exaltation in 5 house and Accidental Fall in 11 house.

Encl updated pic of Planetary Strengths in Signs and Houses.

In some ways, I do agree with Pluto being in exaltation in Leo. The Baby Boomers (mostly Pluto in Leos) had it so great, they got to see America at its peak.

Oh cool! My Mars, sun, and Jupiter are all accidental dignities in 1H, 5H, 9H, respectively. ?

Pluto in Leo is ruled by the natal Suns of those who have this placement. The Sun force is the solar center of the self and the fixed fire Pluto energy is being expressed in its most powerful way (exalted) through the Sun.

I've heard that some people are debating, or re-thinking Pluto's dignity.