The best replacement for double is float.

The best alternatives to double are rated as following:
★★★★★  float
★★★  full bed
★★  decimal
★★  queen
★★  twin
★★  single action
★★  nothing
★★  long
★★  triple pane windows
★  float java
★  queen bed
★  single quotes
★  twin room
★  int
★  single quotation marks
★  full size bed
★  queen size bed
  full
  decimal c#
  triple crank
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  bigdecimal
  float c
  long java
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  single hung window
  twin bed
  double
  queen mattress size
  triple crankset
  double java
  city mini double
  triple chainring
  single space after period
  single action revolver
  single quotations
  compact
  single eyelids
  queen size
  integer
  triple glazing
  triple chainset
  single action revolvers

Your alternative for double is not listed? Suggest!
Speaking about double, one probably shouldn't forget about precision.

Other search terms related to double and their ratings are:
★★★★★ precision
★★★★ printf
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Google Trends

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double
float
full bed