EE placed troughing idler on (R) shoulder with(R) hand over the center can & (L) hand under the angle iron frame to carry the 64lb idler. EE walked approx 64ft when right hand slipped off the center can. EE lost control of the idler & the roller fell end-over-end striking top (L) foot 1.75' behind the steel toe. EE suffered an open fracture & released to restricted duty.