One question: have undocumented residents always/ever been included in the former "47 million Americans" figure?
I'm pretty certain they are.
FYI, I looked it up, and it does. According to Kaiser, roughly 20% of the uninsured are non-citizens (my figures wrongly assumed that virtually all did not have insurance), which means that...
Starting point: 47,000,000
Undocumented, uninsured: 9,400,000
Starting point (exc. undocumented): 37,600,000
Net new enrolled: 16,400,000
Enrolled as a % of previously uninsured documented residents/citizens: 44%
Remaining uninsured (exc. undocumented): 21,200,000
Number of Americans (exc. undocumented): 308,000,000
Uninsured rate (exc. undocumented): 6.9%**This is of course assuming that the 16.4 million did not previously have healthcare, which likely isn't a realistic assumption