Convert enum type to readable dictionary values

EnumHelper.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text.RegularExpressions;

public static class EnumHelper
{
    public static IDictionary<int, string> ToDictionary(this Type enumType)
    {
        return Enum.GetValues(enumType).Cast<object>().ToDictionary(x => (int)x, x => GetDescription(enumType, x.ToString()));
    }

    private static string GetDescription(Type enumType, string name)
    {
        var descriptionAttribute = enumType.GetField(name)
            .GetCustomAttributes(typeof(DescriptionAttribute), false).FirstOrDefault() as DescriptionAttribute;
        return descriptionAttribute != null
            // use [Description] if exists
            ? descriptionAttribute.Description
            // otherwise, convert value to sentence case, handling acronyms
            : Regex.Replace(name, @"(\B[A-Z]+?(?=[A-Z][^A-Z])|\B[A-Z]+?(?=[^A-Z]))", " $1");
    }
}