Series expansion is not working

I am trying to expand a function in power series, but Mathematica is expanding the numerator and the denominator separately.

Series(-((
  0.0435275 (18 - 20 Cos(ky) + 2 Cos(2 ky)))/((1 - 
     Cos(ky))^0.2 (3.03143 (1 - Cos(ky))^1.6 + Sin(ky)^2)^(
   3/2))), {ky, 0, 6})

The output is

SeriesData(ky, 0, {-0.2999998058828007, 0, -0.029999980588280066`, 0, 
  0.006999995470598682}, 2, 7, 1)/((ky^2)^0.2 ((
SeriesData(ky, 0, {1, 0, 
Rational(-1, 3), 0, 
Rational(2, 45)}, 2, 7, 1)) + (ky^2)^1.6 (
SeriesData(
     ky, 0, {0.9999989664885686, 0., -0.13333319553180914`, 0., 
      0.007777769739355534, 0., -0.00026454999113454205`}, 0, 7, 
      1)))^(3/2))

How do I expand the function as a power series about ky = 0?
Note: The function diverges at ky = 0, and ky is a real quantity.