Pasting text that already has formatting in it can be a bother.
The homebrew fix to strip formatting is: Copy the text, paste it into Notepad, Copy it again, paste it wherever.
There is a great program for it: Puretext http://www.stevemiller.net/puretext/
With the program: copy the text, hit WINDOWS+V (instead of the normal CTRL+V and the text is pasted with the formatting stripped out :-)
I use it all the time and it is a huge lifesaver.