Doughty has always been a turnover machine (it comes with being so dynamic and highly confident), but it's gotten worse (visually and according to the stats) since being paired with Muzzin. With an offensive-minded partner, Doughty tends to get extra cute and force the attack instead of making the safer play (which also tends to have worse consequences, because his partner has his mind on offense, too). For some reason, many fans have come to be convinced that Muzzin is the ideal partner for Doughty, but I've been against the pairing from the start. Doughty may be having his fun playing with another offensive guy, but I think that aspects of his overall game suffer because of it.