File vault - can't turn it off / encryption stopped

Hello,
I recentl upgraded to Yosemite on my Macbook Air and File Vault seems to have been turned on by default. I want to turn it off, but I can't until encryption is finished. The problem is that encryption seems to have got stuck. When I open the security/privacy section of System Preferences it estimates the time remaining for encryption to be anything from 600 to 2000 days.
I've tried turning encryption off by running disk utility, selecting the volume and then holding down the 'alt' key when accessing the file menu to select the 'turn off encryption' option, but it doesn't seem to do anything.
Any help would be greatly appreciated.
Thanks.

This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
diskutil cs list | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
Wait for a new line ending in a dollar sign ($) to appear below what you entered.
The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.
The Terminal window doesn't show the output. Please don't copy anything from there.

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Message was edited by: TracyCV

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