So I'm a little new to C#. I made this script in Javascript that parallaxes individual objects at different speeds. But upon converting to C#, I get the error that I can't convert a double to a float on the last line. I'm not sure what to do beforehand to make this not happen.

public class ParalaxScrolling : MonoBehaviour {

[Tooltip("The speed at which this object scrolls")]
[SerializeField] private float parallaxingSpeed;

//The camera itself
private Transform cam;

//Where the camera was last frame
private Vector3 prevPos;
private Vector3 newPos;

void Awake(){
    cam = Camera.main.transform;
}

void Start () {
    prevPos = cam.position;
}

void Update () {
    //Calculate how much the camera has moved by this frame
    float camMovementThisFrame = prevPos.x - cam.position.x;

    //Modify speed by different background speeds
    float movementInX = camMovementThisFrame * parallaxingSpeed;

    //Make MovementInX part of a Vector3, ready for the lerp
    newPos = new Vector3(movementInX, this.transform.position.y, this.transform.position.z);

    //Smoothly moves between current position and the target position (with a smoothing modifier)
    transform.position = Vector3.Lerp(transform.position, newPos, 0.5);

}

}